That actually showed off that Dash can casually break the sound barrier, which actually had me in stitches. I'm assuming a sonic rainboom is on a completely different level but Dash can just pop the speed of sound whenever she feels it.
In summary... It's less of a 'second chance' and more of a 'I'm keeping an eye on you so don't pull this crap again' sort of thing. Take that however you want.
Favorite of the season so far. Trixie isn't my favorite pony, but she was well used here. It was really nice to see the show taking the time to admit that forgiveness and character redemption isn't as straightforward as simply forgetting and moving on - even the best (Twilight) can doubt that genuine change has taken place. Some great humor as well, and as silly as the dinner party was, Cranky is always fun.