Wes' frown is much more prominent. He doesn't like the sound of what Fred's proposing. He tries to intercept her, realising too late that perhaps he should have tried a more direct approach and pulled her into a romantic kiss or something along those lines. But her being on a loss had made him hesitate to take such liberties.

"Fred, wait-" Wes tries to make a grab for her hand again but finds himself bumping headfirst into a magical forcefield. There's a brief flash of blue light and he finds himself knocked back a few feet. It stings a bit, like a mild electric shock.