When you're a Guard, you do a lot of standing still. Anyone who had ever worked security could tell you that. Whether it was a Clone Trooper assigned to guard the entrance of a base on the war front, or one of the Royal Guards assigned to protect the Supreme Chancellor. And yes, that applied to the Sentinels as well, the Temple Guards who remained steadfast in their duty to protect the safety and security of the Jedi Temples. Depending on who you are, standing guard could very well be a very boring affair, spending much of your time counting tiles or speeders passing by to stave off the insanity of going bored. That wasn't the case for a Jedi, at least not this particular one. Vrex took the extended period of remaining in one spot as an opportunity to constantly be honing his awareness of his surroundings, letting the Force become a sixth sense as well as an extension of his other senses. It was like meditation, in a way, but much more focused on a singular goal and nowhere near as spiritual in nature.
A hum, followed by beeping was what drew the Devaronian out of his focus and brought his attention to his immediate surroundings. It was his comm link, specifically the long distance one. There was only one reason for it to be contacted. Vrex snatched the comm link from its holster and switched it on, and he was surprised to see the holographic image of Master Tharn, but something was wrong. He looked off, his face appeared to be contorted, wincing in pain. His left hand was covering a blaster wound on his right shoulder. He was injured, "Vrex..." his voice was partially muffled by static, "...read me? My Clones turned..." more static, "...hit my arm. Not sure... escape... contact the Council and-" he was cut off, but not by static. His image whirled around and an ignited Lightsaber blade defected blaster bolts until the Jedi Master was overwhelmed and shot down, the last image showing was his lifeless form as Clone Troopers appeared.
"Master!" Vrex said, practically shouting. He put the comm link away and sprinted, making for the Council Chamber. He slowed and paused however, remembering that none of the Council were currently on Coruscant. He hastily turned his comm link back and tried transmitting to one of them. Master Kenobi, Master Windu, Master Yoda, any of them. But there was no response. Either they lost their comm links or... the Temple's communications were being jammed. That was the moment when Vrex heard blaster fire coming from the main entrance. They were under attack. He grabbed his Lightsaber hilt and unclipped it before dashing in the direction of the fight. He was a Sentinel, defending this Temple was his duty, and he refused to allow yet another Temple to fall.
It didn't make sense. Clones turning on the Jedi, the Temple under attack. Was this some kind of Separatist scheme? Had they learned some way to take control of the Clones? He'd heard reports that both General Grievous and Count Dooku were dead, which meant the Separatist Army was without its two strongest leaders. It was hard to imagine they could come back after their defeat at the Battle of Coruscant. And yet... Vrex picked up the pace. He needed to do something, anything to be of help to the Temple in its time of need. He could see the main entrance coming into view down the corridor. He could even see many of his fellow Sentinels with their blades already ignited and advancing out the doors. Before Vrex could get too close, one of the Sentinels turned and spotted the incoming ally, but held up his free hand to signal Vrex to stop, "We have the entrance covered!" he shouted, "Clear the interior, evacuate as many as you can! Use the Lower Exit if you have to!"
Vrex skidded to halt, but hesitated. Retreat? But it was his job to fight, same as any other Sentinel. No, not to fight, their job was to protect, and there was indeed many Padawans and Younglings deeper in the Temple that would need protection. Vrex nodded to the other Sentinel and sprinted the other way, back into the deeper portions of the Temple. The Lower Exit the guard was referring to was an emergency lift that could be found in a hidden room deep in the temple. The lift led down into an escape tunnel that would lead out into the Lower City of Coruscant. It was meant to be used as an escape route in the event that the Temple was overrun, and for security reasons the only Jedi who knew of it were the Sentinels and Jedi Masters. Padawans and other Knights should theoretically be uninformed of the Lower Exit's existence, though with a betrayal like this Vrex almost half expected the information to have been leaked at some point.
Vrex caught sight of some fighting ahead of him. Some of the Clones must have made it through the side entrances. He saw a few of them die by the blade of a Jedi before they managed shoot him down. Further ahead he saw a Padawan girl among others running deeper into the temple in retreat. Vrex steeled himself and allowed the Force to give him an unnatural boost to his running speed. He whipped past the Clones, using the Force to push them aside into the walls of the corridor before whirling around and batting a blaster bolt back at the remaining clone with his golden yellow lightsaber blade. Just as suddenly as the blade was ignited it was deactivated again as Vrex went back to running in the hopes of catching up to the retreating Padawan and any other survivors that were with her.
"Padawan!" Vrex yelled out to the fleeing girl, "Help me gather as many as we can find! I can lead us to an escape route!" hopefully the young Padawan wasn't too panicked and would hear his words. As Master Yoda had always said: Fear leads to anger, anger to hatred, and hatred to suffering.