I suppose if you're new to the game that that stuff may happen. But even if you have a loose understanding of the maps you can easily cut behind a corner, and wait. And of course if you give chase you risk the factor of running into one of their teammates, or even getting reversal'd. One of the ways people have been justifying their reasoning is the match lengths for te Halo 5 beta. Many matches ran out of time before someone won, something that was nearly unheard of in previous games. This could be attributed to many things, but the main factor people bring up is the fact that fire fights are drawn out longer because of how easily escapable fights are.