Assuming 2 is a Cw and 3 is an assassin, then if the assassin attacks 2 on the same night that 2 swaps 2 & 3, the assassin will die because he will attack himself.

But what if a reaper's attack is swapped onto itself?

I'm guessing that the reaper will survive with one less soul if it has any.
But if it doesn't have any, then I wonder if it will have reaped itself.

Just a thought.

Edit: Considering how a reaper gets a soul for everu kill it makes, giving it extra lives, then if a reaper reaps itself, I wonder if it will gain its own soul or if it really has no soul.