escorts idle after attack?

[Travis Reed]

What I like doing is sneaking up on small convoys (usually 2 merchies and 2 escorts), sinking the merchies wihtout being detected and watching the escorts run around as if not knowing what to do, then eventually form up line astern and sit there, doing nothing. And yes, I've seen plenty of star shells (usually nowhere near me or even where my torps came from...).