I just want a quick heads up, becaue I don't believe there's anything wrong with how we do this, according to the rules.
The following situation has occasionally come up for us:
Investigator A is standing on an open gate with an explored marker, but he doesn't have enough clues to seal it. Investigator B moves onto the gate, trades him Research Materials/King in Yellow/Old Journal or something similar, and then moves off the gate again with his remaining movement points.
Is that as perfectly legal as we think it is, or have we overlooked something?