When firing a weapon in 0.63, infected in the vicinity will run for the spot where you fired the weapon. This is a great new mechanic, but I also discovered that when they are running for your initial position, shooting at them again from another position will NOT make them run for the new location (unless you're standing close enough to be spotted) until they have reached the first location and found it empty. This is something that could easily be abused to make infected irrelevant, so I hope you change it.