[Dean learned it long before here, but here specifically too he's not expecting any kind of assistance; it's just not there, and if it is, if there's anyone out there that can help him, they should be helping other people. Here, Dean is not helpless, not by a long shot.
That doesn't mean that when help comes out of nowhere he wastes any time at all staring at the suddenly much shorter guard; he registers what happened, of course, knows there must be someone else in the room but that's not important. What's important is they took a shot at the suits of armor, not at Dean (or they missed Dean in an extremely useful way), and he has a very short window of time to take advantage of that.
His sword is out again in an instant - somewhat clumsy with lack of familiarity with this weapon in particular but plenty serviceable, plenty functional - and he puts all his not inconsiderable muscle behind the downward swing of the sword for where a mortal opponent's neck would meet their shoulder. Sparks fly, but he pulls back and does it again, and again, keeping it down until finally something separates and the helmet rolls away to the floor.
He can't tell if it disables the ghost right away, but it does seem to confuse it long enough for him to turn his attention back to the other ghost. If they think they're alive, if they think they're guardsmen still, maybe they'll respond to the same weaknesses. Falling back a moment to catch his breath from the other, he finally chances a glance over his shoulder, just in case.]
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That doesn't mean that when help comes out of nowhere he wastes any time at all staring at the suddenly much shorter guard; he registers what happened, of course, knows there must be someone else in the room but that's not important. What's important is they took a shot at the suits of armor, not at Dean (or they missed Dean in an extremely useful way), and he has a very short window of time to take advantage of that.
His sword is out again in an instant - somewhat clumsy with lack of familiarity with this weapon in particular but plenty serviceable, plenty functional - and he puts all his not inconsiderable muscle behind the downward swing of the sword for where a mortal opponent's neck would meet their shoulder. Sparks fly, but he pulls back and does it again, and again, keeping it down until finally something separates and the helmet rolls away to the floor.
He can't tell if it disables the ghost right away, but it does seem to confuse it long enough for him to turn his attention back to the other ghost. If they think they're alive, if they think they're guardsmen still, maybe they'll respond to the same weaknesses. Falling back a moment to catch his breath from the other, he finally chances a glance over his shoulder, just in case.]
Nice shot.