Rex is probably more accurate than he thinks with that mistake, and it's not taken at all like an insult. Applying any sort of adjective in the realm of 'kind, decent, nice' is in error. He tries, but he generally falls short of those things or does something to change that perception fairly quickly. He's lucked out with Rex so far.

Rex has a lot of wizard things going on, but Toki isn't expecting the knife to come flying back before he can answer. Indrik's somehow forgotten the firepit and gone for the knife. He doesn't try to stop the beast, but he does peer over the bench in the aftermath.

"Are you okay!? It's uh, shinsetsu..."