Can you interrupt a movement action... to take a movement action?

[Can you interrupt a movement action... to take a movement action?]

I think it'd be fair - you're still spending an action. But it's also a way for monsters to completely avoid certain obstacles if they're expected to take two move actions anyway. So I'd fully expect the players to go "You cheating bastard!".

While my first reaction to this reading of the rules was indeed "Kill the lawyer~!!"  I now realize that this implementation is actually quite thematic.  It basically simulates a giant striding over a pond, or a dragon leaping over some rubble etc.

[Rules Question: Immobilzed]

I'm confused. If hero uses his 1st action as movement action, then OL uses Tripwire, hero ofc loses his movement action if he fails roll. But does this mean he can use his 2nd action as a movement action normally? Or is he not allowed to use his 2nd action as movement action?