He blew the place up.....

Yeah, I'll admit to not predicting that Andrew was the one who lit the lighter, but I did predict that he made it out alive. I will also admit that it is not completely clear whether Andrew made it out the back door, but let's look at the evidence:

Andrew said that he barely made it to the door before the blast threw him clear. He didn't say what door he made it to but we know it couldn't have been the front because he is never shown exiting through there before or after the place exploded. And since Andrew lied about some of the events that transpired inside the shop, I think it's safe to say that he lied about barely making it to the door before the blast threw him clear.

If the front door is ruled out then the only other options we are left with is he either remained inside the shop where his Inhuman physiology allowed him to survive the blast even while in human form, or he went out the same back door that we saw the shop owner leaving through in 3x04. You know, right after that goon locked the front door?

Since we know that Lash can be harmed by projectile weapons, it is highly unlikely that he (while in human form) would choose to remain inside the shop when it exploded. No, Andrew going out the back door right when the place exploded is the most likely theory. But since there's no solid evidence to support that hypothesis, it will have to remain unanswered for now.

In conclusion, although I might not have been proven right about Andrew going out the back door, I was very close with the rest of my predictions. But, judging by how I'm being downvoted, no one on this sub cares about how close my predictions were so I will just keep them to myself for now on.