Strange cut in film

Hi,
I was watching Mina hardcore 5on1 fuck session with DP, DAP, TP and Triple Anal SZ2618 and noticed a cut during the tease section just before the action starts (around the 8 minute mark). Mina's ass seemed to go from normal to swollen and sore during the cut. What happened?
I was watching Mina hardcore 5on1 fuck session with DP, DAP, TP and Triple Anal SZ2618 and noticed a cut during the tease section just before the action starts (around the 8 minute mark). Mina's ass seemed to go from normal to swollen and sore during the cut. What happened?