If you ever get sucker punched, you fucked up one way or another. Either you took your eyes off the rodent, you let him slip into range, you let his buddy circle you, you blocked the feign instead of the punch, you were too slow to block the punch, used the wrong block for that punch, or you made some other error in judgement. Nobody can bridge you unless/until you leave the drawbridge down. Figure out how you screwed up, and how not to repeat that mistake. Anytime a punch lands, you should consider it a valuable learning experience (i.e. an opportunity to close a hole in your defense). The wise learn not only from success but also from failure....both being equally valid teachers.