He stretched out to take it, the effort required clear on his face- and for a terrifying moment John was absolutely certain the knife would slip out from his fingers and drop into the water, never to be seen again. Fortunately, he managed to wrap his fingers tightly around it and clumsily pry it open.

"No-- trust me, no intention of staying in here any longer than I have to," he retorted, adrenalin high as he began to hack at the weed wrapped around his leg, hissing sharply as he accidentally nicked himself. "Grab the j--"

And then he felt it. Teeth, snapping at his flesh.
He cried out in pain, thrashing under the water to try and get whatever it was off him, to get himself free of the weeds...