You don't make a typo, press enter and then start reacting to the typo. You start reacting to the typo as you're typing. You just won't get to the end of your

You don't make a typo, press enter and then start reacting to the typo. You start reacting to the typo as you're typing. You just won't get to the end of your reaction before you've pressed enter. The point of my combo comment is that pressing Ctrl + C is not the same thing as typing two random letters of a random word. Combine these two things and I think it's possible for somebody to interrupt a command going out. The question is whether you can press Ctrl+C while typing faster than 100ms, not whether you can react to it within 100ms. Also, people regularly type faster than the speed that pro StarCraft players play at. The sc2 players need the regedit because they will need to press Z 50 times in a row to make 100 zerglings as fast as possible, but you don't need that to type.