Sorry 'bout staying in dorthonion, but I wanted to make Brittons death mean something.
Hero of the Omnissiah
There was an awful purple blast, temporarily blinding, even through the most advanced bionics.
A shuddering tore across the battlefield, as the most advanced sensors started to recalibrate.
The fabricator general saw it first. Across the chest of the mighty, cantankerous warlord was a burning purple scar. Cutting deep through the armour, bubbling, with jolts of lightning and fire leaping across it.
The Titan fell to its knees, throwing up a cloud of dust, like a mighty shell hitting a desert. It started to totter, as the daemons overwhelmed it.
Britton knew he had to act fast. There would be no saving the venerable machine spirit otherwise. He hailed his men, and ordered an advance.
He lead a force of landspeeders, and diamondbacks. Not an official unit, just a force of skittari who Tranth had equipped earlier in the battle. They launched past the thinning mechanicus line, and tore over the daemonic horde. Upon reaching the tottering warlord, they dived at the daemons, crashing into them as if they were a unit of rough riders.
As the attack force shot, dived, smashed and repeated in an endless cycle, the territory around the Titan was slowly cleared. Britton lept from his speeder, and onto the chest of the Titan, followed by a number of the most experienced Techpriests he had. Looking over the wound, he noticed the chaotic curse was being driven back. Throwing around holy oils that'd normally not be used in quantities more than thimblefuls, he aided the machine spirit drive back possession.
Sensors searching the wound for any immediate threats, he froze. In the gaping scar, he saw a single Techpriest. This Techpriest had tentacles.
Leaping into the titans hull, his mechadendrites tore at the traitor, only to be parried by more tentacles bursting from its body. The traitor turned and blasted towards Britton with a beam of fire, severing a mechanical limb. Britton, fearing damage to the Titan, lept at the once man with his sword. Slicing through the tentacles, as more burst from the rapidly deforming body to parry his strikes, he advanced.
Then, he noticed the melta bomb. Inside the Titan, it could turn a potentially recoverable casualty into scrap, forcing the venerable machine spirit into the warp to be corrupted.
Britton knew, that if he continued with his offensive, it would all have been for nothing, and that he did not have time to run. He signalled for his landspeeder to swoop down, grabbed it with a mechadendrite, and used everything else to grab at the chaotic psyker. He found purchase.
The explosion, in the Titan, would've severed it into two.
One hundred meters away, in the arms of Britton, it only destroyed 3 landspeeders.
As the explosion shook the sky, the downed Titan let out a roar so mighty that the daemons around it fled. It hauled itself off the ground and retreated to friendly lines, laying down revenge with its mighty armament. As the Titan reached friendly lines, it fell down again, this time, more permanently, but, this time, it was safe.