Ipsen nods and follows Rufus to the intersection, looking around the corner to the left to see if he can spot anything. Cautiously he walks to the dead end, checking walls, floor and ceiling (if he can) while he goes. Here and there he looks back, to see if something happens in the left passage.

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Same procedure as in the room. Takes ten for 18 and then rolls once for every 5x5x5 segment.
N13: (1d20+8)[22]
O13: (1d20+8)[23]
Listen: (1d20+2)[16]
Spot: (1d20+2)[3]