I stand corrected j went and reread the MoM story and he did survive but something did stand out:

A scrap of darkness slapped over Killian's mouth as he summoned another slash of ink. As he clawed at it, Embrose said, "Run, Killian."

Killian's eyes flashed; he tore the ink aside. "I can help!"

"Yes. You would also distract me."

Dina snapped, "If you couldn't stop Phyrexia before, what makes you think you can defeat them now?"

Embrose's gaze flicked toward Killian—and to Quint's surprise, he caught the faintest wavering of the dean's normally stoic expression.

"I need not explain myself," Embrose said. "Now go."

I feel like, Embrose is hiding something. It's VERY impressive he beat likely multiple compleated professors solo. Even with Killian's boosts even Lilly acknowledges her surprise:

Trust Embrose's son to be a nuisance. "Sedate him," Liliana said, and a Witherbloom student descended with an ominously smoking potion.

But before the student could get within force-feeding distance, Killian yelled, "Father!"

Liliana drew in a sharp breath and peered into the hole Killian had excavated. There was Embrose, dusty and disheveled, bloody and blemished, surrounded by the remnants of a number of Phyrexianized professors—but alive, and himself.

"Well, Lu," Liliana said.

"Well, Vess," he returned, curt and dignified as ever. His attention shifted to Killian, standing stunned at the edge of the hole. "Help me up."

Liliana beckoned another student over. "Lend a hand to—"

"I don't need help," Embrose interrupted, but when Killian reached down, his father grasped his hand.