Thaum nods. He considers shooting the Rod of Ropes through the waterfall to create a taut line to hold on to, but there is the chance of the water masses knocking the grappling hook off-target and the electrified waters damaging the rather useful item, so a more standard rope will have to do. Reaching into his bag, he pulls out a silk rope and what looks like part of a tent, stashing everything that isn't needed right now in his bag and wrapping it in the tent. There haven't been issues with the magical bag having been harmed by water or getting flooded, but better to take care when going through an electric waterfall. He ties the rope around his waist for anyone who wants to get through after him by themselves, then gets ready for heading through (and perhaps taking someone with him).

Spoiler: Random thought
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Handing Coney the Rod of Ropes, Rina tossing her past the waterfall, and Coney grappling to the other side midair.

"I AM RABMAN!"