Read these lines from canto xxii: a. demon armies marching with dante b. demons torturing sinners c. frogs covering the ground d. rivers of hell converging so here on all sides these sinners squatted, but the instant barbariccia stepped forward, they dived back underneath the boiling pitch. i saw, and still my heart shudders with it, one lag behind — just as sometimes one frog will stay back while another leaps below — and graffiacane, the closest to him, hooked him up by his pitch-knotted hair and hauled him out — he looked just like an otter! what is dante describing here?