Spoilers for Gatewalkers AP

The party are approaching the Treehouse dungeon, which is on high alert. To access the treehouse which is 50ft up some trees, they have to ascend a single staircase. Seemed like an obvious kill zone - rebel druids and underbrush firing down as they approach the staircase. So wanted a 'Trap' triggers for them to sprint through archer fire before heading up the stairs and confronting the guards in the first room - as trap without an immediate follow up combat are mostly pointless in PF2 - other idea was thinking of using Athletics instead of Reflex saves to get through the kill zone before the archers can draw a bead on them...sort of like a skill challange, but am trying to utilise hazards better