Leona Random HUGE Crit Dmg!

Hey LoL community,

This just happened to me in an unranked 5v5 whilst playing Leona support. Now i do start with approx 8% crit chance via runes (cause why the hell not) but no ad items or runes. Im not actually sure where and when i crit 1600+ in my game but it sure makes there Jhin look bad. Just wanted to know if this is new with the changes to relic shield item builds (my best guess, let me know what you guys think) or a completely awesome bug for this drop of sunshine Leona main!

Not sure how to imbed images so theres a link to Imgur for ya guys!

Anywho, lots of love from Pancakes!<3

And i DID get my 2nd S for masteries! Yussssss! :3