If anyone watches vlogbrothers like I do, you'd know this because John says it in a Question video. He also said she was in the middle of swimming and drowning. I'm in between swimming and drowning in my tears. Mostly drowning.
I saw many of "grenade" stuff which i'm not sure i'm familiar with. now that I have re-read the book, I totally get it now. I love it how Hazel was going to be a grenade but Augustus turned himself to be. but the sad part is they never ended happily.