Griffon's High Drop! Attack
The attack is described as:
High Drop! The griffon grabs a player character in its claws and takes to the sky. Unless the victim dodges the attack, the griffon grabs them and flies 2D6+6 meters into the air. On its next turn the griffon drops the victim (instead of making a new monster attack), who takes damage from the fall.
Can a PC attack the Griffon before being dropped if his/her turn comes up before the Griffon's next turn?
I ask cause per the description it looks like this is a two-step attack and the attack is not complete until that Griffon's next turn so not sure how to rule this. There is also no mention on how the victim is grabbed (free hands?) or if a grapple can be broken like in the grapple rules.