Rias is bound into straitjacket she struggles and struggle she unable to get it loose the straitjacket is very secure and her mouth is gagged

Rias: Mmmph.. Mmmph!

She struggles again but won't budge

Rias: Mmmph!!

She unable to use her power as she surprise

Rias: Mmmph?! Mmmph!!

She struggle again still unable to escape