Riven and Panth
I have been playing riven for a little bit now, and it seems like when pantheon throws his spear at riven when riven is a low HP, he dies even when using the E shield. Instead of taking damage to the shield it goes straight to the health and kills riven. I also watched a game from box box where this happened. I believed that the shield disappeared right before it hit his HP, but it also happened to me except with me, the timer for the shield was not nearly as close as his.