If Hawke ever mentioned anything about those dreams to Fenris, it would be incredibly likely that he'd laugh her out of the room. He could barely tolerate the woman at the best of times, found her staffing solutions lacking and her inability to hold her alcohol (at best) mildly hilarious.
As long as those weren't mentioned, though, he would, at least, be slightly useful to her. Here, that extended to him reaching for the bottle and rather unceremoniously dropping it into her hands. "Is this the only reason you bring me along, Hawke? To accommodate for your... vertically-challenged nature?"
Well, that and carrying the heavier things. That was probably the other part of it.