Uriel moved with Hakael, hurling a frag grenade when it became necessary, and hopefully clearing the fire warriors from covering the battlesuit -- he intentionally spread himself at the flank a bit to try and turn the armor and give a battle brother a shot with a krak grenade. It was a high risk scenario, and he knew that he would be in for it when a couple of the fire warriors picked him as their target. However, his armor was better than their armor -- a singed pauldron or two was all he took while the bolter fire he gave in return left more bodies in the wake of the squad as it engaged. 

In the distance, he could see their objective, the one the Imperial Guard assigned them. They just had to kill this robotic armor suit quickly; they could have called naval bombardment down from the Repentence, but that would have destroyed much of the landing area that they intended to use for the Imperial Guard -- uneven ground, blasted into superheated glass, would not have been a very good option for a landing, which meant that they had to push a little more.

On the other hand... "Firebase, you need to feint an attack now," he told them over the Vox, "as we have the objective in sight, and are about to destroy it. But you must provide some distraction for the enemy and draw their forces off of us in order for us to complete the mission. Fire whatever you have, even if it requires that you expend your last ammunition, but let it all fly."