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I just read chapter chapter 128 from 4KOTA, it's just so oughhh my heart ;-; so, I've seen people talking about Lancelot cry after Percy was gone but I didn't see tears? Do you think the last panel after he killed Mortlach was him crying?
Firstly, thanks for the question anonymous, and sorry it took me a while to answer it.
Secondly, chapter 128 shook me as much as it did you. And I want to say that we can speculate all we want, but as far as what I think, YES.
You actually made me think about it and reread the chapter. We don't really get to see his face after killing Mortlach, but if you think about it, knowing Lance's character, it's unlikely that he would have cried, at least in front of others. Maybe later, like over Percy's grave. You may have heard this before, but I think Percival is to Lancelot what Meliodas is to Ban. They have the same brotherly relationship only more "tender" than their ancestors.
Lance loved and cared for Percy very much. So to answer your question, yes, he probably shed a few tears for his dear friend off-screen.