Again, a lot has happened:
- Soul Reaver has countered Jharm's counterspell, but he's too busy to worry about the seraphim otherwise
- Soul Reaver took a number of shots from Gulgrim before he started using Blooddrinker to defend
- Thanks to seeing/feeling the manipulation to his rain of fire, Soul Reaver realized Cameron was incoming. He managed to block Cameron's strike with his gauntlet. That lessened the overall impact and dissipated the lightning effect (the enchanted gauntlets do not conduct electricity particularly well), but that didn't dissipate the flames. It blasted him down toward Gulgrim.
- Soul Reaver then dove straight down. Since Gulgrim was firing from the front and Cameron was attacking from behind, this leaves Cameron in Gulgrim's line of fire for a moment. If or how Cameron manages to avoid being hit and/or how quickly Gulgrim adjusts his aim when Soul Reaver dives down is up to you guys of course.
- On his way down, Soul Reaver adjusts his spell. Cameron controls fire, but he doesn't have control over the magics that Soul Reaver is using to control the spell. He adjusts it, transforming the rain of flames into a rain of daemonic ichor. This includes any flames from it already on the battlefield, such as those that are currently surrounding the companions. They'll likely be drenched in it. The ichor is corrosive - especially to metal/armour - and has a corrupting/weakening effect on living things burned by it. This was quite an expenditure of magic but if Soul Reaver is taxed by it, it's not showing. (Note that I'm double-checking this with Cameron to check to make sure that Cameron's control over the flames wouldn't prevent this from happening)
- Soul Reaver's arrival in front of Gulgrim involved an upward strike with Blooddrinker. If it connects, it'll chop away several of Gulgrim's cannons. Since the armor is reinforced with Waagh energy it'll encounter resistance, but the blade feeds on energy and the armour isn't indestructible, so it'll take a good dodge to avoid it.
- Soul Reaver is trying to intimidate Gulgrim and make his courage falter, largely to remove him as a ranged threat. He's done that in a number of ways: first, he has cast a Terror spell. If the Ork can feel fear at all (and I know Orks usually can, though Gulgrim might be different), he will feel intense fear unless he resists the spell. Secondly, several Nightmares are manifesting around Gulgrim. This is happening even without Warp Gates because Soul Reaver/Blooddrinker is bringing part of Inferno itself with him wherever he goes, and this close to Gulgrim, Gulgrim is basically standing in Inferno (I can explain this in more detail if needed). Nightmares are faceless creatures with obsidian-black bodies and long talons who wear ragged, hooded cloaks. They are highly agile and emit a powerful field of fear and illusion. It takes a brave mortal to resist the effects of one of them in their own plane, but Gulgrim has been hit by a terror spell, is facing several of them (about 3) and is effectively in Inferno right now, where the Daemons are at their strongest. And to drive the point home, Soul Reaver has just revealed that he caught several bullets in his teeth and has chomped down on them.
- The Nightmares will start attacking Gulgrim, attempting to tear through his armour. How effective this is will likely depend on how much orky faith Gulgrim still has in his armour after the above.