Not supposed to post about lag but this is a bug!
In this video that I have linked to my Plays.tv you are able to clearly see a problem I have been having for a long time now, my game is only lagging right as I am dying. In this clip as I was about to die, I knew I had heal so I pressed F at what I thought would be the perfect time, but, because of the lag spike that occurs it doesn't register. This does not occur on every single death, I seem to find it only happens on my first death of every game. I don't believe this is a lag spike that is occurring on my end, this is definitely a bug because of the pattern it has only happening on my first death. Hopefully my video can help Riot fix this issue.