chess made my opponent rage quit

I just played a game where my opponent rage quit the game.
Maybe he was under the impression that I was a computer, at least that is kind of the only reason I can think of that makes it understandable to rage quit without resigning.

in this position I figured he could not take on b2 since Rb1 Qa3 Nb5 would give white a significant edge.
So this is not really an option he decide play c4 to prevent castling
and I found Na4! Not the best maybe, but I thought it would be good enough.

Here I thought whether I should play c3 or b3 I ended on b3

a few moves later this position occured

White is probably better in this position, I don't think I played the best move, but I could not resist to play Nh4! in this position, he did not smell my threat his queen is running out of squares and the only way he can avoid losing it will significantly ruin had his position if he does not do something now to prevent the trouble.

But he played Bd7 not solving his problem.

Qh6 and then f5 and here he quit though he could play g5 but the resulting position after hxg is not so pleasent.