Wilbur frowned within his suit as he didn't dare advance on him. This skeleton had proven he had no reservations about taking life and more sacrifices to him would only hurt them in the long run. Worse still, as he looked around, his stomach knotted out of fear when he saw that he and Red Jack were the only Splinter members of the scene. He knew their sniper was going to take on Ned with the others, but where was their Chameleon when they needed her? She could easily sneak up on this skeleton and give them a chance to free his captive and take him down quickly. With just the two of them, it would be hard to pull off an efficient surprise attack or, really any attack without the officer losing his life. He needed to weight the options... he needed a plan. 

First thing first, know your opponent. As the standoff went on, Tortoise quickly accessed the internet and snagged a clip of the skeleton on the beach, captured by someone on their phone at the time. He witnessed his movements, that choking motion he'd made and when his fist had connected with the ground. His sensors had already detected a unique biological makeup and it was apparent he could sow up his wounds very quickly. But now, as he saw this clip, he could also see the skeleton strike the ground and release some incredible cataclysm of power, akin to a large explosion. He'd connected to the ground with his hand... so chances were, that unique biological makeup also granted him some other abilities and he had to make connection with the ground in order to use it. That gave Tortoise a clear initial target for facing him down.

Remove his hands. 

He returned his attention to their situation. The skeleton was holding the officer from behind, specifically using his right hand to grip the officer's gun and holding him using that. Plus, he was facing to the left so he could keep his eyes upon as much of the group as possible, this included the officers, Red Jack and himself. So Tortoise was on his right side and he could see his grip quite perfectly. If he could disable the skeletons right hand, the officer would be able to run for cover whilst the skeleton was recovering from the blow... of course, that was easier said than done. If anything Red Jack's pistol was more suited for this, but he was hesitant to act. Thus, it fell to Tortoise. 

Now, what to strike with... his larger scale weapons like his flamethrower, arc cannon and bomb launcher were all out, too strong and it would probably kill the officer before it did the skeleton. His standard ballistic weaponry was a bit more likely, but it was akin to a rapid fire machine gun and again, was a little unpredictable in terms of accuracy. So that left him with one option... his high powered laser. At high power, the laser was easily capable of searing flesh and bone, normally something Tortoise didn't use against human opponents due to how deadly it was, usually more for robots or large debris or walls. But for someone like the skeleton, who had shown regeneration was not an issue, there was little risk in using it upon him. If he angled the laser just right, he could slice off the skeleton's entire right arm and hopefully get his captive away from him. He'd only have a split second to make the right shot... 

Now he just needed an opening... the skeleton's attention was fairly split between the police, his comrade and himself. Even so, Tortoise felt it necessary to draw his attention so he could pull off his shot. Wilbur had a moment to think back to what this skeleton was ranting about moments prior... some mumbo jumbo about why he didn't have to follow their laws and why he was above all of them. Maybe he could use that to distract him.

"When you live somewhere, you live by the laws of it." Wilbur spoke up, using a microphone to converse with him. "And you're not the only unique being here. Take Red Jack over there for instance." This would be his crucial moment as he hoped the skeleton would pay attention to his partner to verify his statement. "That man is a creature from mythology, born of faeries. Would you have ever thought such beings existed? Surely you'd know about them if you lived before all of this."

Now it was the time to attack. From the left side of his shell, a small silver device popped out with a nozzle pointed right at the skeleton's right arm. Wilbur hit the button in his cockpit and in a split second, the laser fired, striking at the skeleton's arm. He'd turned up the intensity, even if it would drain his shell's batteries a little faster. All he needed was to sever that arm and this situation would become far more manageable.