Wrahn said:Vers will descend trying to move himself right next to the path the archer is falling. I would imagine it is a difficult snap estimation so you may want him to make a to hit roll or an int check to place himself in the route. He is trying to place himself about 50 feet below the archer, his standard move is 200 ft double for descent, should allow him plenty of room to manuever as a move equivilent action. He will ready his standard action and attempt to strike the archer when he enters his zone of control (again with his tail +34 to hit, 1d8 + 29 20/x2) and as he continues to fall through, taking an attack of opportunity (with his tail again)
What happens when a creature with multiple natural
weapons gets to make an attack of opportunity? Does it
have to use its primary natural weapon? What happens if
the creature has a pair of primary weapons, such as a
bear’s two claws.
An attack of opportunity is a single melee attack; no matter
how many weapons or natural weapons the creature making the
attack has available.
When a creature with natural weaponry makes an attack of
opportunity, it can use any natural weapon it has. If it decides
to use a secondary weapon, however, it suffers the usual –5
attack penalty for a secondary attack (or –2 if it has the
Multiattack feat), and it applies only half its Strength bonus on
damage if the attack hits.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.