My thinking was that we had already had something like that happen already/recently and I wanted to get the scanning out of the way and move on to a different challenge. More in character, with Nhaima and probably Wilcon scouting ahead of the main force and routing around problems along with the drone in the sky to help diagnose possible concerns, most easily identified dangers should be routed around rather than confronted unless it would be “interesting”, so I adjusted the die roll to try represent a more extraordinary outcome. ^_^
edit: @matsiyan for the ping.
