Probably comparing timer.duration(tag) <> 0 would work.
Once the timer finishes any expression with the tag will equal zero.
Dude, I´m not a programmer. I'm a designer (tired) and trying hard to make a simple game. ^^
If you don´t mind, can you help me with my C2 example? (it´s a shooter/hack 'n slash with a simple horde system)