As if defiant to the words of the kommando, a wave of shotgun fire tore through the orks ranks just as they stood up to charge. A rain of ripper blasts stops the charging orc in its tracks, blasting it to the ground with the audible crack of ribs shattering and internal organs popping open like ripe fruit. A shoota running besides the nob suffers the same fate, also being blasted to the ground into a wretched heap. The final shot chinks of a third orc's upper arm.

The commisar's barrage of bolter fires too wreaks havoc in the orkish ranks. The same ork that had survived the barrage of ripper shotgun blasts was hit in the leg by a bolter shell. The xenos falls to the ground as its legbone, obviously broken, stabds itself through its leg. This chance is all the commisar needs. Finishing the ork of with two more bolters shells to chest. Turning the entire upper body of the ork in something best described as a quivering mass of oozing flesh. the last bolt exploded against the shoulder of the ork flamer, dealing a rather pitiable amount of damage to the greenskin.

Then, a lot of things happened all at once. Two ork shoots, realizing they had been spotted, moved up from cover and opened fire. Shooting wildly in front of them. Most of the bullets uselessly impacted the trenches fortifications, but four of them found their way into the ogryn. Then, the powers of the warp betrayed the group, and the psyker was assailed by a backlash from the other side. The bullet holes in the stone fortifications began oozing blood, while the ogryn simply shrugged the bullets off like dandruff.

(tl;dr. nob, one slugga and one shoota down. two shootas fired, psyker's perils manifested)