Just to throw in 2cents toward the original topic.
Most times when I don't have a contact on the TIW bearing its most times out of naught a helo/P3 drop in my experience and most times I regret it if I don't start an immediate evasion routine. Those precious seconds are what count. I start with some basic evasive maneuvers at the highest non-cavitating speed permitable. If there's no immediate homing ping then it means there's time to analyze the torp motion a bit and go from there. But if that ping shows up within a minute or 2 then all bets are off and flank speed ahead it is.
But to be honest, my track record against helo-dropped torps is pretty poor... I still don't have a good way to be a close in drop that works most of the time.
