Keep going or turn back. The corrupted ones cannot enter the river as they are. Stronger ones, yes, but not these ones. They will heal, as well- cannot be killed.

Those are your options. Retreat, or press onward.

The patch-wolf yelps as the umbrella's dislodged, but- as the guardian says, the boys can see the hole stitch itself up, flesh and sinew rejoining before skin and matted fur being to regrow.