Fiora riposte the Exhaust

Hi

Sorry if my English is not perfect, because I do not really speak English.

Yesterday, I had a party and I was playing support and I decided to help my top lane where there was a Fiora who wanted to take the tower. Me and my ally have decided to continue and to nou helped in this task I decided to use my exhaust on Fiora, but at the same time she used her ripost and my exhaut not working. Fiora had no negative effect of the exhaust and my fate was in cd. It should not be a champion that can block a summener spell.

Want to thank you very correct this problem and sorry for my grammar