If it were the Flood, the affected Legionnaires wouldn't have returned. They'd have had even more deaths on the team today, this is true. But people still had to be carried off that shuttle, and Sombra wasn't the only one still walking who looked like they'd been through the wringer.

It's a good sign that Cortana's still brushing things off, but it doesn't mean they're as fine as she wants him to think they are.

"Cortana," says the Chief, gentle but firm. "What happened to you?"