A3 Addendum
While Sporegg is right, I do want to add two comments to this.
First of the spell specifies a "hand-held weapon", a undefined term. Interesting enough all weapons except things like siege weapons are hand-held weapons, this includes ranged weapons (in fact my Google associates "hand-held weapon" with "gun" in 50% of the results). It already is badly worded and could use some common sense interpretation.
Secondly it shares wording the Fire Shield spell, but that one has a line lining with reach. Because of the same wording it sounds right to use the reach clause for Eruptive Pustules too.
It specifies melee reach weapons though, so by RAW a hand held crossbow would still trigger Fire Shield.Originally Posted by Fire Shield
A4
Part of the confusion spell is that there is a 25% chance to act normal. So when you roll "act normally", the moonstruck target still wants to attack with its natural weapons in preference to other actions (for example: aiding a friend, fleeing, or drinking a healing potion). However he still could take other actions when acting normal because nothing in the spell actually prevents him from doing so.