Mess with her more.

While her boyfriend was still trying to put on her dress again and pulls it from underneath her you start to stop time again.

You pull the picnic blanket off Bella and start time again. The you stop time again and make it look like the wind was really just flying the thing around.

The boyfriend runs behind the blanket and is in complete shock of not being in control of the situation.

He also in embarrassed that they were making a big scene and everybody was watching his nude girlfriend.