[edited out of respect to SSD cos' I didn't read his reply properly...]
Yup, it's the AoA that really makes this different - the pull up is so extreme he's still moving in the X axis whilst nearly vertical (and then there's the bizarre way in which he returns to level flight.) . I'm guessing he's leveraging a bit of his ability to 'prop hang' the Sukhoi...
Helicoptering down the River Neris
Then there's his personal altitude limit...
"Nine Inches. I can't go any lower."
Of course, it's the bridges he's known for. Here's one of 'the ten bridges of Vilnius'...
Kairys' on Bridges
The bloke is a genius, and should be dragged back to his Sukhoi cockpit for one, last, hugely televised outing, before he disappears into aviation legend.
[For more about him, take a look at Jonas Dovydenas excellent articles care of Seqair. Google will get you there.]