@sunny That's one way to start your morning!
I think you have a couple options here- really depends on where you are at when you discover the leak. Option number one would be go ahead and unplug your controller- this is a little rough but it will do the trick! That option is obviously only useful when you are close to your controller.
Option number two would be to grab your phone, click to the history/updates tab, and hit stop there. It sounds like this may be what you ended up doing!
v03 should give a little more accessibility and control when it comes to acting on whatever is currently running...