We had a very rare rules question pop up recently. 2 People had enterd the same other world and both were in the first area (2 gates to the place were open). We had 1 Find Gate spell. Now if person A casts find gate succesfully is there enough time to give Find Gate to Person B before Person A returns to Arkham so Person B has it.
On the one hand you might argue that Find Gate happens imediatly and that they are no longer in the same place so it can't be done.
On the other hand it was ruled that trading can happen at any time exceppt in battle. Either way it was the movement phase and we were in the same place.
Also unless you can show me an official ruling I don't want anyone to say that items can't be traded in Other Worlds. We were in the same place so we always play it that trading is fair game.
We decided that the trade could NOT happen since we were doing pretty well and the chance we'd need Person B to get out of the OW a turn early was small at best.