While Hermione isn't the smallest person playing in this snow war by any means, she's certainly smaller than many of the others, especially the giant qunari who, thankfully, happens to be on her team. She doesn't mean to use him as a shield, but the few times he's happened to catch her diving behind him when the barrage of snowballs started, he doesn't seem to mind.

Or, at least, he's too busy pelting their enemies back to really just push her away, if he really wants to. But given how much he seems to be smiling through all this, Hermione figures it wouldn't hurt to use him as cover as they get closer and closer to one of the enemy forts. If he can keep them distracted, maybe she can make a mad dash and grab a flag without getting frostbite in the process.