Okay, so the plan as is appears to be that:
- Mark will carry James (who is mostly okay and will only need a bit of help to get going).
- Douglas will dump all of his spare explosives by the entrance to the escape tunnel.
- Charles will help someone carry John for as far as necessary.
- Non-combatants will be at the front of the escape effort (Arad, Sara and James once he is up to walking again).
- It might be helpful for some kind of secondary blockage to be arranged; if John has a suitable spell available then this would be good.
- Everyone not otherwise engaged in a job should be at the back mounting a defence just in case the demons have a go at catching up.
There is one further point that no one seems to have considered: there are five cultists still tied up who aren't changing. If you need it, leaving them tied up might buy you some time while the demons kill them.
Any objections to the above, otherwise we shall proceed.