It's pretty clear the player was trying to invoke their high concept there. Since they seem disinclined to put a fate point on the line on their own, it's time to throw a compel at them; clearly, in their overconfidence, they ended up caught in the fence, tangled up and restrained for whoever comes by and finds them. If the player buys off the compel, then they can make it over, no problem (as a fate point would've provided the +2 needed to actually clear the barrier normally.)
Edit: in other words, they failed, and I choose to escalate that failure, putting a fate point on the line to make the situation go from "failed to cross fence" to "failed to cross fence and hopelessly tangled up in nasty wires that'll shred you in moments if you're so foolish as to try to revert to human form to extricate yourself."