[thejsa]

Have you tried clicking the ‘End Task’ button twice? It’s arguably rather unintuitive, but in my experience the first click seems to send a ‘politely quit’ signal and the second results in the merciless massacre which hasn’t failed me yet.

[ineedasername]

Yep, sometimes after a few attempts a box will come up saying "this app is unresponsive" and it seems about even chance if that will end the task