Aahz doesn't make out anything notable between the tall grasses, including any trampled paths leading to the tower, at least from this side of the hill. This itself implies the tower isn't being used by any humanoids, including the bandits.

There don't appear to be any lights visible away from the tower, so they're likely tied to something happening either inside the tower or around its base.

Spoiler: OOC
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Quote Originally Posted by Hawk7915 View Post
Assuming the darker green is difficult terrain?
Yes, sorry for not noting this immediately.