So I visited the Fast 7 IMDB and it stated that Han is in the cast.
From Sean Boswell's view(Tokyo Drift): He was running towards the direction of the vehicle (passenger side) and the car blew up but I believe someone pulled Han out of the vehicle just a few seconds before the explosion. Sean was running therefore everything seemed a bit 'blurry' for him?
From Ian Shaw's view(Fast 6): Ian rammed Han and stepped out of the vehicle, dropping the necklace (which I believe is Dom's?). The camera then focuses on Ian walking away from the scene on the phone which then questions that maybe yet again someone quickly dragged him away from the vehicle but Ian was walking away and didn't notice someone was helping him out. He heard the explosion and thought that is that.
From DK's view: He witnessed the crash, witnessed the 'boom' and drove away in quick succession. I think he was only waiting for the explosion, didn't pay attention to the surroundings.