Anyway on topic. The people wont be temporarily invincible when they slide at you will they? Cause i don't want to shoot someone in the face a bunch of times as they slide at me, and still have them knock me down to do all sorts of unpleasant things to whatever remains of me.
No, you can still shoot them. It's kinda the disadvantage to sliding - you are more vulnerable.
However, players can still shoot while sliding, but with a penalty to accuracy.