Delay 2 "collision" events on the object

// Sory 4 bad engliish

I'm trying to make a "brick breaking" games, and I'm facing some balls breaker problem.

What i want to do :

In order to break one particular type of brick, the player must make the ball collide with it twice in 4 secondes.

So the ball collide with the brick, and then he has 4 secondes to make the ball collide with it a seconde time to kill it.

What i tried :

<img src="http://i.imgur.com/7sdZAP0.jpg" border="0" />

I know it seems too complex for what I try to do but I tried a lot of simpler options and this one is the only one that seems to work half the time.

The problem :

Half the time, the brick die on the first hit.

I don't get it, and i think a could use a fresh look on what i've done.

time expression - counts from the begining of your game, not when event triggers

You need to make a custom timer for that brick.

Make an instance variable for that brick called "timer" and set it to 4

When your ball hit this brick for first time, set timer to subtract 1*dt and then check if another hits are within timer limit - between 0 and 4.

The block should have an instance variable ... let's call it NumOfCol

On Collision with block | Add 1 to NumOfCol

If NumofCol = 2 | block : destroy

Every 4 seconds | Set NumofCol to 0

Cheers

Thanks you, both of you helped me figured out the solution :) have a nice day.