I don't intentionally try to kill any dream characters. On occassion within a lucid dream I have set fire to someone, and I remember making one guy's head and eyes bulge by willing it to happen, but I think that was more in need than anything else.

I had one dream where I was being chased by virtually every one in the dream. It started with some sort of unseen monster chasing people through the streets, but as the monster caught people up, they became chasers as well, until I was the only one at the front being chased by everyone else, and I felt that at some point soon I would become a chaser as well. It was at that point that I ran into a shop and was cornered by some chasers who had entered the shop from a door on the other side of the room. It then dawned on me that I was dreaming, and I stopped running and turned to look at everyone surrouding me. They all stopped as well and stood staring back at me. I then used the 'force' I guess to make them all go flying across the room.

So no physical weapons in my case. If I feel I need to escape from someone, I use my mind to make something happen.