As the rest of the group makes their way to the tower roof, Durgan moves forward to examine the stairs. He starts by peering down the stairs. He takes a good hard look at the staircase to make sure it'll be safe for the group, and when he is satisfied the stairs will hold, he begins to slowly move forward, listening carefully for signs of foes below.

Spoiler: rolls
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Knowledge Engineering (untrained) (1d20+1)[7]
Perception (1d20+3)[18]