Re: OOC#2
I fully agree with Archonia's approach, but in this case I don't think we need to use up any limited resources if we scrutinise the spell details, because I think we have it covered.
We have 1 more round of stinking cloud, which will be the 3rd round of the heat metal. The spell says on the 3rd round creatures in metal headgear will be made unconscious plus take an additional 2-8hp of damage, after the initial 1d4hp of damage from the previous round. The spell also continues to inflict damage after they are made unconscious, so I propose it would continue to keep them unconscious, because they would be in utter agony being burned alive. This is where it is different from sleep when they might wake up.
I'm no doctor, so I do not know the likelihood of an unconscious opponent waking up if they are still receiving ongoing additional damage from an external source. Sure if the pain stopped they might come to, but if the source of the pain continued burning them worse, I do not think it is likely they become more capable because their bodies would actually be in a worse shape from additional burns.
On the 4th round of the Heat Metal, which will be the 1st round after the Stinking Cloud dissipates, the creatures are still helpless, plus taking 2d4hp of damage which is when we move in and slit their throats, whilst we kick their weapons away from them. (Just in case)
On the 5th round if they were still alive they'd take another 2d4hp of blistering damage from the spell, and a further 1d4hp of damage on the 6th round.
Hieroman hasn't used her flask of oil, and nor will she. At best if I am wrong with the above explanation I think any bugbear would only be on a couple of hp, they aren't likely to be still holding weapons, and they will fairly easy kills for the group.