Cerulean Cape there's your obstacle.

Penn frowned at the creature. Maia didn't appear to have any better idea of what it was than he did, though her suggestion was a fair one. "It does look kinda like a spider," he mused aloud, "If spiders were made of rocks..." He hadn't touched it yet to know for sure, but that certainly looked like a hard shell encasing it. That was intriguing in itself. Something so well protected had to be hiding some delicious meats, right?

"Let's find out if it's edible, hm?" Penn suggested, a bright grin dancing across his muzzle as he picked up his paws and hopped over to it. The crab stopped its scuttling and stared at him, little claws raised. Ignoring the defensive stance (and honestly, just not even noting it for what it was), the Blackthorn reached out to grab it. Unfortunately, he was not the only one capable of grabbing. In the next second, Penn was reeling backwards with a yelp, the crab now attached by its pincer to the wolf's upper lip.

"FUUU---" Penn screeched, surprised and in pain. He flailed his head backwards, hurting himself even more as the crab held on tight to him. He dropped his head to the ground then and tried to grab at the crab with his paws and pull himself away, crying,  "GET IT OFF ME!" as he failed to free himself.