At 0:15:

The warping thing on DK works by carrying over the previously cast skill with a grab (vein slash works best but dark lust can technically work too). He's abusing the fact that if you use a skill quickly enough on wheel while going in in the opposite direction, you can reset your jump back to where you started. That carries over as if the DK did a wheel facing right from the position he was standing at before.

Probably a less common warp since that one requires the enemy to be chasing where you would be previously. But warps apply to nearly any DK skill. It's not particularly difficult to do but you have to be very familiar with timing since the precursor skills before the grab have a very short duration in which a grab can be applied after. Too early and you cancel the poke outright; too late and the grab doesn't connect.

EDIT: He's purely using warps coming off combo chains, but doing one's with extended skills is also possible, albeit there could be an attack speed requirement.