@JosefinaArenas,
+1 on the Krav Maga!
The place I was at, at Halloween he had everyone pretend to be slowing moving zombies. A few people even dressed up as zombies! They were slow movers, about 6 to a square. The square was about 20×20′. You had to keep them away from you by, using speed, pushing techniques, and being aware of your small space as not to box yourself into a corner.
It was fun!
As to the OP (that I just noticed), I was at a outdoor public range, 100yrds. I was shooting a .22LR from the prone. The guy next to me was on a bench, shooting his AR15. The distance was just right and I had his spent brass raining down on me. I ignored it, and kept on shooting.
He stopped. Then when I stopped to reload, he apologized profusely. I just smiled and said it was good training! I am pretty sure he thought I was crazy, but laughed.