Is it immently dangerous - possibly
Did they get away with it - yes
What is it about airshows that result in (hopefully) disciplined pilots pushing the limits beyond what they need to make the show look good? All too often at an airshow someone spears in and occasionally it takes out an innocent party.
I love airshows and I love seeing transport aircraft going through their paces but if this clipped a wing and went in we would all be criticising the drivers.
Cheers
TH