What happens when a giant boulder comes out in the arc as a support token such as the stonemason's cart? The boulder "destroys all monsters" but the cart is "not a monster". We house ruled that the cart driver was able to move out of the way so the cart suffered a glancing blow, losing a point of health just as if it had encountered a monster on its space.
Page 9 of the Dark Titan rulebook.
"Support tokens hit by Boulders are always destroyed."