Just as planned..well, except for the fact that the insurgents arrived sooner then expected and began to target him as well, although luckily it could easily be assumed to be misses on the Tiger team from their point of view due to how far away the group was and how inaccurate they could be. Time to get going! By they time they drew close enough to get a good shot off, bullets whizzing around him all the while, he darted around the corner to safety and stealthily made his way around back and over to the back entrance, opening it as silently as possible, peeking inside to make sure that they hadn't heard him. They hadn't, but that wasn't all luck because they would have had to have been looking his way in order to catch him, not focusing on the battle at hand. Rez let out a smirk as he leveled his gun at one of their backs; the one standing furthest to the left of the group.

He would attempt to take them all out before they noticed him, nonchalantly letting loose his entire clip in six seconds as he strafed from left to right, riddling the area with thirty fresh new bullet holes, hopefully each body filled with around half a dozen of his bullets so that they could all share in on his "present" to them. He didn't take time to aim too much in order to get them all covered as quickly as possible before they had time to react, so it was possible he'd miss some of them, but if they didn't notice him in time then the odds would be greatly lowered. 

If they turned around and attacked him then he'd duck back out of the door and behind the wall to it's left side, reloading his clip as quickly as possible in preparation for the next engagement. They probably wouldn't be able to rush after him due to the gunfire from the opposing side, so he should be able to pull this attack off with little difficulty.