This is a continuation of what the team had to say.  And apparently it was the colors that they detected:

“This is the first time we’ve seen this in the normal visible colours, and we now know it happens,” Dr Tucker said.

“The fundamental way we believe that core collapse happens is related to this shockwave happening. So the physics has been around … for decades and we’ve finally now been able to physically examine and test what’s going on.”

Also a note that other supernovas they observed in a similar fashion did not display a shockwave.  Their theory has to do with the distance it has to travel to be seen.

We hope you enjoy this video and although the comments on the video are closed feel free to comment on the post with any ideas on them.

thanks to discovery.com for the great info