The spiked insectoid fighting Nazgrel will attempt to bite him and then claw the Xorn. (TH 23, 27, 23, 22, 12) The spiked thing bites Nazgrel hard, but Nazgeel resists the venomous effects. (Damage 12, Fort Save 22 vs. 19) The xorn is devastated by 3 claws from the fiend.
The other spiked thing...