Izrah knelt down over the bleeding trooper. "It's okay, let me help" he spread his hands wide across the wound and started kniting the damaged tissues back together. The soldier screamed and kicked Izrah away, "get the hell away from me freak! i want a medic!" Izrah looked over at the commander of the PDF aid station who very pointedly ignored the exchange. The commander argued long and hard to keep the Bio-mancer out of his medicae tent but had eventually lost the argument and while his orders where to bring the Bio-mancer into the aid station there where no orders stating that he was supposed to use the psyker and he certainly wasn't going to order anyone be treated by a freak. 

Izrah shoved the man back down, though he was much weaker than the soldier "Im trying to save your life soldier" he said firmly, but anger rising in him. All the medics where over whelmed by a major battle between a hive gang/chaos cult and the PDF forces. Most of the wounded soldiers had grievous infections in wounds that where only minutes or hours old. The battle was still raging and wounded where coming in from the first contact with infections that could have only grown over days or weeks. Izrah tried in vain to staunch the bleeding and pull the infection from their bodies. Each time he touched the infection with his mind he felt the Chaos corruption in it, but he ignored the danger of it. He was trying to save lives, and he was a Medicae psyker after all. He was trained to prevent corruption. 

Nurgle's plague had only touched his mind a few times but they had planted the seeds of a creeping chaos in him. his corruption was slow, growing like a tumor. Months after the cult was smashed and purged Izrah was still unaware of his slipping control. Even now he dreams of the beautiful and deadly poison gardens in Nurgle's domain. When he is allowed to heal soldiers they have all invariably died of infections that where virulent and swift. The commanders have not yet noticed because the only soldiers he is allowed to try and mend are lost causes anyway. The medics pass over Izrah's cases as they are already dead men, their bodies have just yet to realize it. 

The Chaos corruption was destroyed but imperial law has been slow in retaking. The PDF still fight slowly regaining control of the planet. Izrah's corruption, still in its infancy, has only killed the wounded at his aid station and caused one of the medics to fall very ill. He was not suspected until he disappeared to serve his patron god and embraced his corruption.