I'm not 100% certain on the answer to your question Jirgen, but I would say the OL is the only player that can end a monsters move using the expand feature. If you read the rules book concerning Large Monster movement, it goes to explain that the OL player is the person taking advantage of expansion, not heroes. That's a good enough distinction, and makes the most sense. There is a serious difference between the cross bow moving a dragon one space, and moving it four (with expansion).
Whoops, it looks like I stand corrected. RagsMckay has the answer. I don't agree with that answer one bit, but if FFG Sez, well, that's what they Sez.
Edited by Cursain, 21 November 2013 - 07:53 AM.