possibly a GAMEBREAKING PROBLEM, i'd like to know what's that about...please HELP

Hello, and thank You for reading this. So, i was playing skarner in a game (should be the last one of today): when i was in my spires, the buff kept switching on and off (with all the sounds and visuals); all my teammates (and me) had experienced this problem: their champions looked like attacking thousands times a second, but none of this attacks actually hit the target; the abilities were delayed; monsters and minions were visible only after a short delay from the moment you faced them. Our ping was pretty good - to - average. thank You for reading this, i hope this will get some attention. cya in the rift! P.s.: a friend of mine made a research, and it's actually a hack. plus, the next game everything was perfectly normal. And here's the match: http://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/2393634844/42555721?tab=overview