The splashing is more than enough to catch her attention, and Jo is quick to turn despite being mostly submerged, treading water as she reaches to draw her knife from the sheath at her belt.

"Dean!"

The blade might not be much in comparison to the size of the tentacles, let alone the kraken itself, but damn it, she'll work with what she's got. She dives beneath the surface, holding her breath but forcing her eyes open to get a look at where Dean has been pulled, moving forward and slashing at the offending appendage when it dares to come near her. She surfaces a moment later for air, but she's still close enough to strike, her jaw set as she plows forward, focused.

"Let go of him, ugly!"