Jager is an infested spy Think about it: At this point its somewhat certain that the infested are semi-sapient and likely controlled by a hivemind. Jager was "shot down" in his chopper.           
 The *only* infested that is capable of long ranged attacks is the APEX, who is likely smarter or even a controller of the hivemind.                  
So we have Jager, shot down from a somewhat intelligent creature, crashing down (which is *extremely* loud) and lying wounded and unable to fight in the open.                    
Yet he is not attacked by a single infested until the operators arrive, at which point we're absolutely swarmed.                    
Seems more than a little fishy, no?