Librarian Artenius was largely impassive to all the gallantry and zealotry that was going on about the kill team, he knew too well the fragility and erstwhile fragments of happiness that even the most verdant of emotions could bring. No, the soul is tempered by the unwavering march of steel, not by the weak temptations and corruptions of the flesh that emotions ended up becoming.  Instinctively, Artenius lightly flexed his mechanical arm before allowing it to become relaxed once again. He muttered a short prayer of thanks to both the Emperor and to his Primarch, whom in his falling blessed his sons with the knowledge that the flesh was, in all ways, weak.

“The Son of Russ shou-...” Brother Artenius began, though his gaze was soon transfixed by the sight of the mentioned Space Wolf cracking open his brother's skull and consuming the brain within like it was some manner of barbaric delicacy. “By the Throne...” the Librarian spoke, though he knew too well that all Astartes could consume cranial matter the sheer thought of those contained memories constantly shrieking about the mind was...disturbing, to say the very least. 

Shaking off his revulsion, Artenus began once more. “While the Son of Russ scouts ahead of us, we should form a tactical formation and retain a swift movement speed. Nothing overly complicated, and remain sparse in our grouping, these Xenos have immense firepower.” 

He paused a moment, allowing himself a moment of pondering. “No doubt the arrival of the heretics will cause one of two outcomes. Either our target will flee like the dogged coward he is, or he shall stay and try to fight against the coming storm... Neither is ideal, as such haste is advised here.” The librarian spoke with what seemed to be great wisdom for someone who hadn't actually held command rank in all his hundred year plus of service. 

“Brother Bacara should remain in the second rank, where his heavy weapons may serve more useful to us – it is vital he does not get bogged down by the grind of melee., as always. Brother apothecary, you shall remain also in the second rank, your medical talents are far too useful to simply waste due to random luck on the enemy's part. Besides, you carry the sacred lifeblood of the gene-seed, that alone may not be allowed to fall by any means.  Brother Fellwalker, you are to serve alongside me in the front, as such it is your duty to ensure that foes are no permitted access to those brothers who talents are at distance.”