I don't know that it really applies to this video, but there are other videos out there of people recording video while looking at the window at the explosion, where they're far enough away to have a few seconds' warning before the shock wave hits.
After watching upwards of 3-4 videos on reddit today, I can confidently say that a large fire indicates an explosion is possible.
In this instance, a massive and towering inferno in a port/construction zone/etc would be a reasonable marker that an explosion is possible and likely imminent.
Looks to me like he may have seen the explosion and then instead of dropping to the ground, reached into a satchel to retrieve a camera. I'm very very sorry for this person and his friends and family.
I don't think staying away from there door in that case would've made much difference. The shockwave flattened everything.