I've been playing a 15 minute game each night on lichess and just crossed 1450 points. This is a surprise because over the board I'm about 1150. I'm either getting lucky or my tactics/puzzles skills are punching above their weight on lichess. I just won another game due to a surprise resignation two moves after this situation occurred.
I made the bad move shown by the red arrow, which would have led to a game-ending fork; do you see it? His knight would take the pawn on d4, forking my king and queen. And the e3 pawn could not take the knight because that would put my king in check! I walked right into that move and, very lucky for me, my opponent didn't see it, despite having all the time in the world on his clock! It's possible they quit because they realized what they'd just missed and in a fit of annoyance at themselves -- pulled the plug.
