Why does it appear that you have 2, maybe 3 different plugs in that first photo?

 

They are all the same plug, photo just made them look different for some reason. The one was just broke along with the coil.

 

That is bad the coil and the plug just bursted how did that happened. Is the engine still good and running.

 

What exactly happened here?

 

I'm going to venture a wild ashed guess.

The plug was defective right out of box.
That happens occasionally.

While the coil performed perfectly at first.
Sadly, the 30kv output did not have a path to ground. That's due to the defective plug.
So the coil would have overheated, then exploded.

Buy another plug and good new or jy coil.

 

Looking at how the plug exploded that same plug looks like it has broke it's prong tip. If you noticed or not make sure that did not fall into the engine cylinder.