Absent specific instructions not to, Lewys is also going to dive in the plane, just behind Bilhah and Evantia.
The expedition is, on reviewing those snapshots, in fact quite clearly in several different fights:
A hopelessly disorganised mob who are turning over some kind of armed encampment for loot, containing the corpse of a truly gargantuan twisted tree horror along with a bunch of dead Briars, are being occasionally picked off by remaining Briars using the fact that they clearly don't all know each other against them.
A variety of small units that appear to mostly be led by magic users of various stripes - the highest concentration of Urizeni are here - are getting mildly ambushed by ettercaps in an area with deep, sticky miasma and lots of dripping sap; they seem to mostly be holding their own but the ettercaps have a habit of grabbing someone and making off into the jungle, which seems unlikely to go well for those people in particular.
The main logistics train appears to have been left in a remarkably peaceful area of weirwood trees; a small detachment of Highborn in red and white tabards, some with a horse, some with a stylised earthquake, has been ambushed by giant centipedes making their way between this and what looks to be the ruined walls; they would be doing better if they weren't focused on preserving a bunch of carefully wrapped items they appear to value more highly than their lives.
The 'front line', such as it is, is strung out along the ruined walls; they appear to be fighting the jungle itself here, including possessed animals and bloated giant insects, but also the great thorned vines that still bind the walls. This is an ongoing pitched battle over a few miles of terrain.