In episode 12 Vegas left the key to the handcuffs conveniently on the bed. Vegas knew the hedgehog was dying yet he said he will go to the vet, I think that was a way to leave Pete alone so he can escape. There was no surprise on Vegas's face when Pete walked out but what was baffling was his choice to stay. Pete sacrificed his freedom to console his abuser. Pete was the first one to choose him. He was the first one to show him kindness after discovering the ugly truth of what's hiding underneath Vegas's mask, DON'T FUCKING HURT HIM.
Remember the spark in vegas's eyes when he turns around to Pete before getting shot, they are finally bright with love, gazing at the person who chose him above everything. He won't betray that person, he will look at pete with those stary eyes forever and cherish him. HE WILL NOT HURT HIM *manifesting π*