No clear view from that angle, but in all likelihood Griffin uses his off-hand to clear obstacles. That’s his ‘modus operandi’. Have a look at the supposed “Dunk of the Year” on Pau Gasol:
Griffin clearly uses the off-hand to push Gasol down – this one ended up basically strikes Gasol in the face with an elbow. That’s an offensive foul.
Additionally, look at the much-publicized dunk on Kendrick Perkins. Foul.
The dunk on Channing Frye. Another Foul.
Even the dunk on Mozgov is pretty bad.
Griffin’s dunk on then-Knick Gallinari was egregious – he actually grabs Gallinari’s attempt at a block, and pushes it aside… yet no foul called. Look for yourself:
There’s no doubting that Blake Griffin‘s an amazing athlete, and that he does do some amazing dunks. But as often as not, these high-flying aerialist dunks, are an example of how the NBA have become a slave to the hype.
Decide for yourself.