Problem with enemy that shoots

Hi

I?m having issues with an enemy that throws an object during an animation

Occasionally only one instance of my enemy spawns its projectile

I have my events set up so that Construct 2 tests for a specific animation and frame then is set to only trigger once while true to make sure that no more than one axe is created while frame 1 is displayed.

The problem is that occasionally while one instance is playing that frame and animation the other one does so close behind it that they overlap. At least that?s what I think is happening.

Can anyone advise me on what the best way to solve this issue would be?

I?ve included a Capx which replicates the problem here:

dl.dropbox.com/u/56373295/Construct%202%20Files/Shooting%20problem.capx

Any help would be appreciated

thanks