Mixed Reaction
Before a final time elapse
There will have been at least two gaps
During gaps, folks time they’re biding
While a dozen halt their sliding
When a certain red line is crossed
It means that you may have just lost
A masked man sometimes saves the day
Stopping projectiles aimed his way
The appearance of a red light
Brings both vexation and delight
What am I?
Check Braingle.com for the answer.