and it even was on f7...
You both rushed this 10+0 time control game as if it were 1+0 bullet.
Despite the short game you both made several blunders.
5 Nxf7 sacrifices a knight for nothing.
Black was winning: a piece up for no compensation.
8 Qf3+ immediately allows to regain the piece.
8...Kg8 keeps the piece