Only the wounded one can attack from the current position. The others either don't have enough range or can't see the target. There's a rather elegant move here, but Treebeard won't throw the bomb this turn. Against the enemies) It's easy against his own units.
Treebeard is in a situation where he can't swap places with anyone. Unless it's with Albrecht. Because moving through a unit costs 2, plus another 1 to stand on the cell behind the unit.
Oh yes, in battle, Gorthric moves twice because of his 25 initiative, but his second turn is after the Guardians.