When Maglor returns, Elros stands by the mead, and he has stirred it a few times, but he's mostly watched the door, and his eyes continue to follow Maglor when he enters and fetches the ladle. He doesn't understand what all of this means, only that his question must have hurt Maglor much more than he would have thought.
He wants to ask why, but that'd hurt Maglor more and he doesn't want to hurt him (not anymore, there was a time when he would have continued much differently from here, would have turned to accusing questions - did you murder your wives, too - but that is long in the past). But he needs to do something and the easiest way to do that... there is a quick, almost cautious, questioning glance at the older male's face and then Elros very carefully wraps his arms around him. Sometimes people are so sad that the only right thing to do is to hold them, especially when you can't actually do anything about their sadness.
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He wants to ask why, but that'd hurt Maglor more and he doesn't want to hurt him (not anymore, there was a time when he would have continued much differently from here, would have turned to accusing questions - did you murder your wives, too - but that is long in the past). But he needs to do something and the easiest way to do that... there is a quick, almost cautious, questioning glance at the older male's face and then Elros very carefully wraps his arms around him. Sometimes people are so sad that the only right thing to do is to hold them, especially when you can't actually do anything about their sadness.