[That's very not good. Frisk is a sickly child, and he doesn't even know Lutha, other than that the man's incredibly abrasive.]

Okay. What's most important right now, if he can still move, is getting to shelter. If you can help him, even just to steady him, please do. If it's too much weight for you, please find him some sort of rubble, like a long plank he can use as a cane. Whatever the nearest apartment is, head or it, even if you were planning on getting to another point today.