After seeing it in closer detail, EK26 appears to have taken B link then changed his mind to take A for departure. This left him a tight angle and the left set of main wheels appeared to run a few feet into the grass with the nose wheels at the far side of the taxiway just about to go onto the grass, effectively diagonally across the taxiway. Similar to cutting a corner in your car and bumping rear wheels on the curb but on a grander scale