Let me translate this dramatic revelation in natural American English:

Sophia frowned, surprised that this was Matthew's first concern.

"It was a matter of life and death."

"Bull! Life and death my ass! If Dominic knew what he was doing, why didn't he do it himself?!" Matthew was so angry his chest was heaving. He grabbed a glass of water, took one sip, then threw it to the floor, cursing under his breath.

Sophia initially thought he was ...