CM
Adventurer
An unusual circumstance came up in the game tonight and I was wondering how you would resolve it. Stop me if I make a mistake in the following chain of events: 
An archer was backed into a corner, threatened by a monk. The archer attacks with his crossbow, which provokes an AoO from the monk. The monk chooses to make his AoO a trip attack. He is successful and the archer is knocked prone. As his followup attack (from improved trip) he chooses to disarm the archer of his crossbow. The archer has a -4 penalty on his opposed attack roll because the crossbow is not a melee weapon. Does the archer also suffer the -4 penalty to melee attacks for being prone on his opposed disarm roll? Does the monk receive a +4 on his opposed disarm roll because his target is prone?
I went halfway in the ruling. I said that because the monk's target was on the ground and couldn't avoid the attack as easily, the monk would get the +4 on the opposed roll for a prone target. On the other hand, I ruled that the archer did not suffer the -4 penalty to melee attacks because he was not making a melee attack, he was simply trying to hang on to his crossbow. I figured that the prone character's -4 penalty to melee attacks was based on the idea that lunging toward your enemy is more difficult when prone. Holding onto something while prone shouldn't be more difficult. It may even be easier (an american-rules football player in the bottom of a tackle pile, for example).
Thanks in advance for your help.

An archer was backed into a corner, threatened by a monk. The archer attacks with his crossbow, which provokes an AoO from the monk. The monk chooses to make his AoO a trip attack. He is successful and the archer is knocked prone. As his followup attack (from improved trip) he chooses to disarm the archer of his crossbow. The archer has a -4 penalty on his opposed attack roll because the crossbow is not a melee weapon. Does the archer also suffer the -4 penalty to melee attacks for being prone on his opposed disarm roll? Does the monk receive a +4 on his opposed disarm roll because his target is prone?
I went halfway in the ruling. I said that because the monk's target was on the ground and couldn't avoid the attack as easily, the monk would get the +4 on the opposed roll for a prone target. On the other hand, I ruled that the archer did not suffer the -4 penalty to melee attacks because he was not making a melee attack, he was simply trying to hang on to his crossbow. I figured that the prone character's -4 penalty to melee attacks was based on the idea that lunging toward your enemy is more difficult when prone. Holding onto something while prone shouldn't be more difficult. It may even be easier (an american-rules football player in the bottom of a tackle pile, for example).
Thanks in advance for your help.