My new Hero, Lars Andersen

so, what is the technique ?

Yes, the film does not really show how he does it. My impression is that he holds all the arrows with the bow hand, nocks already close to the string. The string hand then goes forward, grabs a nock, nocks, pulls, lets loose - then repeat. I am not sure, however, if the arrows are on the left or the right side of the bow. It could be left.

he draws the bow just few inch, surely not a good military or hunting technique and suitable just for very close targets

I wonder if he modified the arrow nocks as well...

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thanks

The technique he used is very close to documented arab technique.
He indeed shows his technique in a very short segment in his vdo.
I had tried with three arrows and the technique is quite sound compare to russian school.
Says, you have three nock in draw hand, one above index, one between index/middle and one between middle/ring.
Assuming one is familiar with arab style nocking and thumb draw.
First put thumb over the one over index, nock, then thumb draw.
Second put the thumb over the one between index and middle, then nock then draw.
The third is a bit difficult for me but it 's ok. Put thumb on the one between middle and ring, then nock and draw.
I did quite slow at first but getting use to techniqe now. Hope I could do double or tripple tap trick shots soon.

I strongly suspect he modified the nock. It is seen in his draw when doing the technique that he is not adjusting for nock angle at all. Within the realm of his effort, that's legitimate, as nocks were modified for shower-shooting. So "fair ball."

I've played with that style, and it's okay with Sassanid as well, but since the guys I imitate are universally shown arrowhead-in-hand, the technique isn't as suitable for me. (Plus, magyar/Cuman kite-shaped arrowheads are huge and heavy, and I'd hate to try to hold those from that grip.)

Shower shooting is in the trick shooting sections of Arab Archery and it clearly states that special arrows are made for this type of display. Holding the arrows near the heads is the only method shown in illustrations of battles or of warriors (e.g. some Mamluk metalwork, Seljuk coins and the Kashan dish depicting a siege).

Shower shooting is meant to shoot both rapidly and in volume. Taybugha, in Saracen Archery, mentions shooting three arrows and suggests holding them between the fingers of the hand. The Kashan plate shows what is probably meant to be one arrow being drawn and two in the hand. This implies that in the military sense rapid shooting was done in groups of three. Perhaps it was the first shots of a charge before the troops wheeled away from the enemy front.

Shooting displays as part of military themed public entertainments were well documented and in Mamluk times furusiyya manuals detail what types of performances were expected. Whether in archery, lance work or swordsmanship, the high level of skill needed is obvious from reading the texts. These were opportunities for warriors to show off their skills to their masters and for the sultan and the amirs to show the skills of their troops to the assembled people. This does not mean the performances were exact replicas of real battle techniques. It was more like the entertaining and complex marching done at the Edinburgh Tattoo rather than what the same soldiers would do in battle.

Agreed, Bede, and the Hungarian sources also ONLY show arrowhead-in-hand; though its use may have been also, if I recall correctly, during sieges, such as the siege of Acre, where the defenders were stunned and appalled at the density of the incoming arrow shower. If one had a lot of manpower and an appalling amount of ammunition, that would seriously improve the chances of your poor bastards going up the ladders.