Another similar thing is to be a tech/hotwire, walk into building and plant C4 and then walk up to a PT and just stand there. When the timed goes off the detonate your remote. If someone is deactivating it then blow the remote and kill em' when the get close. This works like 50\% of the time. Only time it fails is if someones particulary alert or runs their cursor across you. People don't expect to find enemies in their base if it's not being attacked and nothing appears out of the ordinary.