Gears of War is like "CRAPPP, they got us pinned! THEY HAVE [insert term for big spider thing]'s WE NEED BAC*screaming as they are eaten*"
Space Marines is like "Feel the righteous fury of the God Emperor! Cower in fear for I have arrived to send you and you misbegotten kind back to the abyss from which you came. *said while carving a bloody path through a endless horde of xenos with a chain sword* "