This event is kite kite kite...
2 spiders pop, DPS one spider kite the other. I think DPSing Cinder first is good because the other one aoe ramps.
When Cinder is at 40% stitch spawns Kite stitch and kill cinder.
After cinder dies you will get baby spiders that spawn forgot timer. Kill these spiders just F8 and kill them. They have low hps. Have a ranger/druid track and make sure you didn't miss any. They hit hard, but have no hps.
Next kill stitch (you will still get baby spiders adding during this)...
After stitch dies the AOE dot stops(same aoe from ambush event) and the baby spiders stop.
Bring in pryo and kill him, he's gimp w/ no aoe no spider adds.
Biggest thing again is curing. keep people cured same way you did on ambush. The dot is more concerning then the DPS the mobs put out.

Rough Bazu Bone Compound Bow
Tarnished Dagger
Tarnished Spear