oh, ouch.
Next time, make sure your opponent sees it before you resign. I dunno, it may be worth it just in case; he might be so intent on attacking that he plays g4 or something. I know it's happened to me where I make a totally game-losing blunder and my opponent either just assumes I didn't or just blithely makes a move on the other side of the board... great fun when his reply is a gross blunder too!
en.lichess.org/KxAJvbhuINQwIn the opening I sac'ed a knight in the center and rather than recapturing and winning, my 2168 rated opponent sacs *his* knight in reply... and gets crushed. Not *really* an analogous situation but funny anyway.
- The Taurist