Bug rengar / yi

I encountered a bug ... or cheat of some sort ... i was playing brand top vs rengar ... and every time he ulted no exclamation mark apared on my brand (i was premade with 4 friends and they had the same thing as me ) .. eaven in the part of the lane where there were no bushes and all was warded ... i saw him enter ulti and became invisible ... but no exclamation mark apared on me when he jumped , and next bug brand's ult cancels when be casts it on master iy (when he uses q) ( i don;t know if this is a bug or not ? Please help ...
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