Slippery
A tsunami breaks your bones, not from hitting you, but from making the ground slippery. The water from the tsunami made all the sidewalks and stairs too slippery to walk on, but you tried anyway, slipped, and broke a couple bones.
Imagine trying to get back up on the slippery ground. You've already broken a few bones, but you slip again, breaking a few more.
かつ
すべ, なめ
None
As you struggle on the slippery ground you hear a loud yowling sound. You turn and see a bunch of stray cats (かつ) slipping and sliding too. They're coming right for you, uh oh!
Picture the cats trying to walk on the slippery ground. Their legs keep spreading, so they try to jump, but that makes the slipping worse, and they go sliding forward and topple over their fluffy buns and onto your broken body. Now the cats are all perching on top of you and your broken bones as they try to avoid the slippery ground. It would be nice if they didn't have their claws out.