Sure, I will use the perception roll from before.
You can easily tell, especially after the Speriethiel that you attackers must be elves, their forms are a little blocky, so you guess they are armored. There are three of them, two on the ground carefully engaging you group's combat monsters with a third firing from good cover on the roof.
You also have a little thing in your mind saying there is something off, but not with your attackers. That is all you get for now.