Your first screenshot only shows him killing you, nothing about a building sign.
And your second screenshot only shows him warning you for NLR, which could be possible as you have an NLR timer on top of your screen, but as I don't know where your base was, I can't judge about that.

This is not enough proof for actions to be done, if you have more, please add it to the thread.

Your first screenshot only shows him killing you, nothing about a building sign. And your second screenshot only shows him warning you for NLR, which could be possible as you have an NLR timer on top of your screen, but as I don't know where your base was, I can't judge about that. This is not enough proof for actions to be done, if you have more, please add it to the thread.