The net dilates at the last minute and the bloodbeast is bashed backwards, sliding down the tunnel's floor from the inertia and leaving a nice red smear. Another leaps around it and charges...

And the grating beneath it buckles as a thick cluster of tendrils yanks it downwards. The beast falls out of sight with a satisfying splat.

Well, they can't go back. May as well keep going. Down the tunnel, to a concrete service annex, down some iron stairs to the side. The tendrils are now more present, hanging overhead... a few yank open the grate to a service elevator, the last part downward.