If you can't get away get an equalizer.
The Dog Brothers came out with a good DVD on this topic for law enforcement. Here's the trailer:
http://youtube.com/watch?v=c0fPL4f3Eqc
And by the way when drilling with the knife there is constant resistance and monitoring the knife. Although there are patterns to follow most drilling is done with no pattern so you don't know where the knife is going.