How to handle a swindle??

Never expect an opponent to resign. If you make that your mentality you will treat the rest of the game as a game to win by focusing and converting. If you have the mindset of "I already won.", you are more likely to succumb to tragedy. Puzzle rush can help you see basic tactics when low on time and if you can manage your time earlier you won't even be in that situation. Just continue to practice and don't feel entitled to a win otherwise negative emotions may take effect if you lose.

It's almost always worth playing on, if only for half  dozen moves, to see if you can get compensation or see if your opponent starts wobbling.

They're so annoying, you expect your opponents to resign, they find sudden counterplay you think and lose on time or dont think and get crushed.

How to handle those???