Guild Wars 2

OK, I’m finally able to advance.

I just restarted the quest and got to the bit where the Pack Marmox just sits at the top of the hill.
What I did was drag an enemy towards the Pack Marmox to make it run down to attack, it ran back up after so not sure if that was what solved my problem, I also tried to make sure noone died, either way a cut-scene triggers after you clear the beach.

Not sure if that helps but it worked for me!

I’m in the same boat as you guys, Pack Marmox just sits at the top of the hill…