Choose a particular hazard, such as falling, being tripped, triggering traps, mind control (or another fairly specific power effect, such as Damage with the fire descriptor) or a particular skill with consequences for failure. If you fail a check against that hazard, you can make another immediately and use the better of the two results. You only get one second chance for any given check, and the GM decides if a particular hazard or skill is an appropriate focus for this advantage. You can take this advantage multiple times, each for a different hazard.
"Damage with the fire descriptor" is pretty common. Could one take "Second Chance:Damage with the Unarmed descriptor"?
for a bare knuckle boxer?
Too common? Would both descriptor cost the same if taken as Immunities?
How about attack checks? Does "Close Combat: unarmed" count as " a particular skill with consequences for failure"
I should think not, but what about Countering checks with using X Effect or Descriptor?
What about Second Chance:Acrobatics checks for Feints, Second Chance: Intimdation for Startle, or Second Chance: Aid ?
I would probably guess that using it for attacks checks of any kind should not be allowed, but what about these other offensive combat actions, are they also a bad idea?
As for Triggered, I wanted to leave an area under observation, "warded" so the Triggering condition would allow the character to see what was going on, just like he was still there himself. Is this a legit use of Triggered?