Sometimes the bad guy is very close and if you are clumsy or had too much coffee, you may accidentally press an arrow twice, resulting in loss of game.
Bummer and unfair - the game is to test your ability to overcome human failings in planning, not your dexterity.
To fix this, the CAPS LOCK can be used to establish the speed at which button pushes are accepted.
On FAST, it is the same as before. On SLOW, there is a slight delay so if you push too soon, your second push will be ignored.
Of course (human failing) if you forget to use the SLOW button and get caught then it was fair. You had your chance and blew it!