You see this happen once in awhile (any big name fights come to mind?) where a fighter will just start throwing submission attempts over and over and give up position after getting timed. Chiesa just was spamming the triangle after he missed the first attempt, Lee timed it, and Chiesa gave up position. You have to be crafty on bottom, mix up your attack, and wait for the right moment. You can't be that aggressive on bottom at this level. Great work by Lee for taking his window to victory when it opened.