About Those Black "Engine Spots" on Each Side of the Flight 93 Crater

There are two blackened spots on the ground that apparently (supposedly) correspond to where the engines of the plane hit the ground, they are separate holes next to the main crater. You can see in the 3rd pic that the "engines" created their own little craters.

Close up of the crater. You can see the black spot on the eastern (left side) of the crater is much bigger than the other side, for unclear reasons. 

 

So what exactly caused these black spots? 

The obvious explanation is that fuel burned intensely there from the engine that hit there. OK. Maybe. I don't have any other real explanation for these dark spots.

Now supposedly, one of the engines bounced away from the crash site and OFFICIALLY landed ONE MILE AWAY, which is truly absurd for a plane that went in the ground the way it is supposed to have.

We don't know which of the black engine spots was made by the engine that "bounced away". Maybe the less black spot?

Still I don't know why the engine that bounced away would cause a spot. 

But the other issue is we have this photo of one of the engines they dug up from the crater. It's a bit absurd that the engine fragment is only 2 feet below the surface, max, considering that the rest of the plane is much deeper and the engine is very heavy with huge thrust.

Anyway, why isn't the soil black all around the engine and why isn't the engine covered black soot?

Also, where is the rest of the parts of the engine, like the cowling? There should be remnants all around this part if it was really found here.

BUT ultimately nothing here really makes sense. There are two black spots here and we don't know why and no one else seems interested in this.