Despite Arkham Horror being a cooperative game, one of the glaring holes I noticed the first time I played was that it doesn't appear that multiple investigators can attack a single monster, and vice versa.
I've read the rules a couple of times, but wanted to make completely sure:
If two investigators are in the same space as a single monster, Investigator A has to either Evade the monster or pass a Horror check, then fight until they either win, flee or die. If Investigator A flees or dies, Investigator B has the same option to either Evade or pass a Horror check, and fight as normal. At no time can they somehow gang up together and add their Combat together against the monster, correct?