Screw aiming.

When you really need to sink that submarine.

When someone torpedoed your colleague and you're damn sure that the sub is still skulking around

"I must kill, for I knows no chills"

Screw aiming - if you hit something, it either was an enemy or will very quickly become one.

It's not screw aiming-in actuality that's how you're supposed to use depth charge since making a blanket of bombs will increase the chance of one hitting the sub; and from there it's chain reaction time.

See: Hedgehog

That is the face of someone who knows the terror of So-class submarine (flagship)