Would a confused character attempt to attack an invisible ally?

[jesuscraig]

I am in a situation where I will be boxed in with an ally who is confused. On my turn my intent is to cast invisibility as a spell like ability and close a door, trapping us in, however this character is considerably more powerful physically than my character so I'm hesitant to do so depending on the following question: Would a confused character attempt to attack an invisible ally?

Some information to ensure the answer is relevant:

I'm currently outside the room and I need to take the 5 step in order to close us in, so my space will be known, at least partially.

From the confused allies characters point of view If I cast the invisibility first, I could stay outside the enclosure and close the door from the outside. So the character can't be sure I am in the room.

The confused character character has line of sight to all components of my intended actions.

I would probably run it as a stealth check vs the opponents perception to determine if I am in the room, if the perception succeeds attack the square as normal (50% miss chance), but the likelihood of him succeeding his perception check vs my stealth seems lower than I would expect to simulate this situation.

Any thoughts on the situation, as I would really like to maintain this closed door to separate two very powerful characters who are both confused before they got stuck in an aggressive loop.

[Diachronos]

I imagine that they would only attempt to attack allies that they are aware of. In this case, they're aware that your character is there, so they would probably try to attack you. However, since you're invisible, they have to guess which square you're standing in, and then roll their miss chance for total concealment.

[llaletin]

It's going to depend on the interpretation of the situation by the players and the GM, there is no clear cut answer here. Some other factors that might influence this are; has one of the confused characters already been attacked? If so then they'll retaliate regardless of the door. Otherwise it'll be down to the confusion effects, percentage roll and interpretation of the situation by others..... If you explain your rational, the GM might be inclined to agree and let the effect ride out without too much violence coming into play...