[She certainly notices that odd shift in his expression but pays no mind to it in the end. Maybe he just doesn't take too well to getting his ass kicked? She did say she wasn't going to go too easy on him, but she doesn't want to injure him either.

When he charges, Tifa can sense the fake out, watching how he carries his weight in his feet, and how the punch doesn't have quite the same weight as his knee does. Observation was an early part of her training, and she's fought enough Shinra grunts to know how to spot one.

She doesn't knock him off of his feet this time, but instead blocks the kick with her forearm, and then goes in for a high punch with her other hand, and as soon as he lowers his leg, she'll alternate fists, between left and right, high and low, with one aimed in the middle there somewhere.]

Next lesson, [she says between breaths.] A trained fighter will always spot a fake punch before it hits.

Use the momentum in your fist to land the kick instead.

[And then, she demonstrates exactly that.]