I don't get it.

So i played a ranked game on my other account, where I had a jhin adc. All was fine and dandy and then jhin had about 10-15 health left and then Morgana used her E and he just stood there in it.. And died.. So he blamed it on me.. Told me to "gtfo" and I said why? And kept pinging me and kept saying "gtfo" so i didn't really say anything after that, so he then leaves my lane to join mid and leaves. Me to 2V1...and then comes the jg so now it's 3v1 and the mid laner was even saying for jhin to go back bot.. He didn't listen, so he just sat there and farmed and fed. I don't get what his deal was because he died once to Morgana and blamed me? Lol this was ranked too so like Idk but I did report him it was rough though.