It's a passive effect, so it happens everytime it is possible, right from when the text is in play. So it will engage the new first player when the token is given to a new player.
If you use a card to engage him, it will engage you, but if you are not the first player, it will re-engage the first player without any time window for an action but you can proc sam or pippin response this way.
Thank you! My question came about because I am using Sam and I was not sure if I was able to trigger his response but it makes sense now because the guardian would move to the "new" first player during engagement phase...just to be clear, we have to exhaust a hero to claim a key right? I noticed the keys don't have the guarded keyword on them but some do attach to a location or guardian through the quest text. At that point we have to damage the hero or explore the location to have the opportunity to claim it?
Thanks for your help, sorry for all the questions
Edited by oldoly, 17 August 2014 - 09:36 AM.