Well to be fair i found a solution to make him mount, but you will have to make a group member run to the nearest pack of 5-6 mobs and pull it to Thrall, where you will have to die and let the mobs kill Thrall! He wont die - when he is at 1% hp he will heal to 100% and you will be able to kill the pack and talk to him again where he will actually mount afterwards. BUT when he is hiding in the trees the same thing happens and you will have to pull another group of mobs and kill him again - after that you will be able to talk to him again and he will continue... NOW at the last boss i havent found the solution for the quest to be completed -.-
I've tried:
1, Pull all mobs myself and killing everything without him dying (didnt work)
2, Letting him pull mobs while hiding in the house (didnt work)
3, Just killing everything because Thrall suddenly stopped moving inside the house and was frustrated... (didnt work)
So if you follow the steps with "killing" Thrall you will be able to get to last boss, but i dont know how to complete the quest, which is my intention with the whole run... Please fix this