Question about "Attacking from Above"

[Kromm]

Treat the initial jump into an ambush as any combat maneuver that makes sense: Attack, All-Out Attack, whatever. Combat time hasn't started at that point, so the creature has loads of time to set up and technically isn't even taking a combat maneuver. In combat time, jumping is just another way to move, so it's Move and Attack.

Acid spiders do not attack from above, though. They're jumping spiders that lack webs on which to descend and that are too large for Spider Climb to work without magic (which they lack). They just lurk 20' or 30' down a dark side tunnel and rely on Stealth.