So you have an opponent trapped and you want paintball tactics to take him out? If you have a teammate and have good communication, pinching is an extremely effective method.
What you do is attack the bunker from both sides. One of you blasts the bunker, pinning the opponent down while the other teammate advances. Then your teammate pins the enemy down while you advance, and vice versa.
Eventually your opponent will have only two options:
1.) Get eliminated
2.) Run
Either way, your chances of taking him out have gone way up if you are able to pull this off.
What other paintball tactics have you used when you have an opponent trapped?