(dont think it has been suggested before, feel free to prove me wrong)
Remember in HL2 being able to pick up saw blades and shoot them? Well what I'm thinking is
like that but all in one weapon, so no running and picking up things with the gravity gun and whatnots.
The idea is that once shot the blade will spin and when it collides with a wall or obstacle it will stick with half the blade out of the wall.
formers pls