The Krieger was, unsurprisingly, extremely quiet as the argument between the superior officer, in this case the Celestian, and the Deathwatch Apothecary continued. As far as the Grenadier was concerned, speaking out against a superior when they were acting within their station was grounds for summary punishment. Whether that meant execution or otherwise was of little concern, as like most of his kind, he'd not seen disciplinary actions occur once actually trained and deployed in regiments. Training while growing up saw such things happen, but it was meant more to mold the subject vice punish them, so it was commonplace to hear of Kriegers who had been disciplined in their youth growing to be fine military leaders. But that was nothing worth pursuing, thought wise, feeling a sense of relief when they made their way towards a bunker.
Standard Cadian pattern of construction, likely a local mix of concrete with duraseteel bar reinforcements to prevent shattering from creating glaring openings after one explosive hit. He preferred Death Korp approaches to bunkers, being built far more sturdily, but then again, he did not expect generalist Guard regiments to understand how to dig in properly for the long haul. They had no excuse not to, but they were not held to as high of standards. Being handed a Cadian Pattern Missile Launcher, he would have preferred a Mk.III Mars Pattern, the model issued to Krieger heavy weapon teams, but once again, he was hardly amongst his own kind. The Deathwatch Apothecary had already taken out a target, though this did little but excite the greenskins. Sweeping his gaze, Ansgar spotted what looked like a crude bike with an ork waving what was very much a demolition charge, of their sort. Rather than waste a krak missile and likely miss, due to the things small size and speed, he rested the missile launcher against the wall, safed to prevent misfire, and lifted his Type XIV (Heavy) to his shoulder.
Bringing the 4x sights online, Ansgar took aim on the waving ork's arm. Normally, this kind of shot would have been extremely difficult with a conventional lasgun, or any sort of weapon that would require multiple shots to cook off the orkish explosives prematurely. As he exhaled, he fired off a tight burst of hotshot las rounds, and all it took was the last one to hit the charge to do precisely what the Grenadier suspected would happen. Upon impact, the lasround caused the charge to detonate, tearing the Ork and his crude bike quickly to shreds. Quickly slinging the Type XIV (Heavy), Ansgar picked up the Missile Launcher again, resting it on his shoulder and, unlike the Astartes, took quick aim using its sights. The incoming fire phased the Grenadier little, getting shot at while trying to aim was business as usual for all of them really, and before firing, Ansgar gave the rest of the group in the bunker fair warning. "Firing, stand clear!"
With that, he loosed a missile, krak in variant, and the missile flew low across the ground, almost brushing against the dirt and grass, hitting scant feet before the plow equipped war buggy, blasting a rather deep crater into the ground. At first glance, it was a miss, but the buggy quickly proved otherwise, not having time to avoid it, the plow digging down into the ground as the warbuggey hit the sudden pit in the ground would be bringing it to a rather unpleasant sounding stop. Ansgar saw the stop throwing one of the Orks clean from the wrecked warbuggy, and hitting the ground rather roughly, and that plow buggy would not only be stuck, but brute forcing it out of the way would not be nearly as easy, slowing the advance of any orks behind it. Ensuring that the magazine attached to the Cadian missile launcher had loaded the next krak missile, Ansgar began taking aim for his next target.