TRICK ARROWS: Give Speedy a ranged combat action; Speedy can remove from the game up to three hindering terrain markers, or barrier terrain markers (removing makers one at a time) to which he has a clear line of fire at the time the marker is removed, after which he can make a ranged combat attack.
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So can speedy remove hindering which is part of the map?

That would not be a "hindering terrain marker", so no.