Walking Dead Episode 2 - 'Q' doesn't work

Hi there - I'm not sure if this is a glitch or not, but it is about the scene in episode 2 where Lee gets attacked by a zombie in the back of the pickup truck:

After he has kicked the zombie 3 times and fallen off the back of the truck, every walkthrough I've read says to just press Q until the others kill the zombie. I do exactly this and the Q button is 'activated' successfully, as in the arrows reach the Q button in time, but then nothing happens and Lee dies. I've done it ten times with still the same result. Can anyone help?
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