"I'll explore the other way" Ipsen says to whoever is next to him at the moment. "Open the door if you want, but stay near this room." Then he disappears into the darkness.

Spoiler
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He listens carefully while he sneaks down the passageway, using his little steel mirror to peak around corners. Of course, he looks for traps, alarm mechanisms and other unusual things the whole time.
Listen: (1d20+2)[15]
Move silently: (1d20+6)[18]
Hide: (1d20+18)[37]
Search (again, taking ten before every check):
(1d20+8)[17]
(1d20+8)[27]
(1d20+8)[28]
(1d20+8)[16]
(1d20+8)[11]
(1d20+8)[27]
(1d20+8)[14]
(1d20+8)[18]
(1d20+8)[27]
(Don't know how long the way will be. If he needs to make more search checks, just roll them for him and let me know if he finds something.)