When someone challenges you for a 1v1 with a bet, and you win it, but then...

...the person that was suppose to do their part of the bargain blocks you from their friendslist.

Long story short, I played a Riven game and won it. The enemy jungler, who was feeding, told me after the game he wants to 1v1. I said sure, why not. But only with a bet, which is a mystery skin. We do a Riven 1v1. I win it @ lvl 3 after he's used both his exhaust and ignite, and then he types in /all chat "wp wp". After some verbal intercourse I tell him it takes a day for someone to be on their friendslist to be able to send a skin. He says "np". I get blocked.

Thanks Rito.