I'm curious if the startup time, plus the overhead of Git trying to figure out what you might have meant is significant enough to give you enough time to realize and hit ctrl+c. In testing it quickly, it looks like typing the wrong command and having it spit out the possible matches without running it takes 0.01-0.03s, so I would venture to guess that it's still not enough time between hitting enter and then immediately hitting ctrl-c, but maybe you're very very fast?