I was playing Shen for the first time, and I noticed that the bars on the left side of the screen showing your allies' HP don't display properly all of the time. Now, this may have been a case where he was nuked down to 0 in an instant, but his HP bar still showed him alive until I moved my camera over to the location where he died at.
This also happens when you hover over an enemies dot on the map. It'll show them at whatever HP you last saw them at until your camera moves to where they are.
I don't know, it just seems kinda pointless to have bars that don't update properly.