weak blitz 3 is the the 3-4 predator formation as well as the 3-4 under formation. what i do is blitz the re(as you are looking at the screen) because he originally drops in to zone coverage, reblitz the already blitzing inside line back and place right in between the le(as you are looking at the screen), make sure the inside linbacker that is blitzing is a few steps behind them, pinch the line, and the blitzing ilb should shoot right through the a gap.