You'll need 'Combo' Variable
Default is 0
Punch Event 1
-Check if Combo is '0'
-If yes, it should set combo as '1'
-Execute Punch
-Wait 1 Second
-Set combo back to '0'
Punch Event 2
-Check if combo is '1'
-If yes, it should set combo to '2'
-Execute Punch 2
-Wait 1 Second
-Set combo back to '0'
This already deals with cooldown of attack 1, and combo 2.
<img src="smileys/smiley1.gif" border="0" align="middle" />