Dren continued slinging his ice magic, seeing as it was pretty effective against the goblins, freezing them many a time and cracking their frail bodies into bloody ice pops. He caught wind of the berserk being with the scythe was shouting at them to get moving... and then promptly left them. Even through this mist, Dren could see his fleeing form. The utter nerve would've made Dren bluster and blather were he not mid combat. 

Dren spied the other two fellows nearby. With the one injured, they'd need a little extra backup... as much as he didn't want to be here. With the aid of a few quick teleports, he passed the remaining Goblins and turned up at Cas' side, covering their backs with spells as they continued to move toward the left. 

"What the bloody hell is causing this mist? This doesn't seem natural!" Dren was no stranger to spells, obviously, but causing mist... seemed too specific to be a spell targeted at them. Could it perhaps be an after effect of some vile forest dweller? Even he was unsure.