It's because he ran to slow bcz of his stomachache after all the ml did to him previous chapter. Imagine sex 5-6 hours brutally nonstop and u think u can walk straight or crawling straight? That what happened to him. And ofcoz ML much faster than him. And one more fact, MC still in didn't right mind bcz his mind so fcked up rn so he didn't think fully to run away. And one more to follow the novel plot

I started tweaking when he went on with that monologue instead of running for the hills during the brief moment when that psycho was thrown off guard from the punch idc if ur naked JUST RUN