PARIS — Mark Moogalian and his wife were seated facing each other on the high-speed train when he suddenly told her, “Get out, this is serious.” Then, Isabelle Risacher Moogalian said, she ducked behind some seats as he lunged to grab the assault rifle from the gunman’s hands.

“When my husband collapsed, I saw across the seats. He looked at me and he said ‘I’m hit, I’m hit.’ He thought it was over and he was going to die,” she told Europe-1 radio. The bullet struck him in the back and exited through the neck.

The American teacher and artist who has lived in France for more than two decades has emerged as another hero in the high-speed train attack thwarted by a group of quick-thinking men. According to French President Francois Hollande, a Frenchman was the first to encounter the gunman as he left the toilet, alerting others in the area. That person, Hollande said, wished to remain anonymous.

Moogalian remained hospitalized Tuesday in the northern city of Lille, and his sister in Virginia said his role in trying to stop what French authorities are calling a terror attack was in character.

“Mark would give anything for anybody,” Julia Allen told NBC News. “He’s just that kind of person.”