I played UFO EU yesterday. Like I said - on mission with crashed UFO few Sectoids were dead and rest alive was inside UFO. No one was outside. They have no time to disperse. XCOM team works with lightning speed
Actually there's no "escape button" in GUI during ground battle. I know from autopsy that this is useful. Any chance to get it in next release or later?
Bug reported already. Will be fixed with next release.
I made post about it some time ago
http://www.goldhawkinteractive.com/forums/showthread.php?837-v.8.9-Intercept-bug