Reflect damage on the fire knight is broken sense the release of the patch :/ if all 5 champs have the buff when he counters hitting all 5 champions. The reflected damage only removes one counter from his shield when you hit him one (single hit) time it drops to 5 on the counter. 

In the past when chit by the fire knight it would drop the counter to 5 and a single hit would reduce it to 4.