Kenny Pickett, the Steelers' quarterback, got hurt during a game against the Texans
Coach Tomlin doesn't know how bad Pickett's injury is yet
Pickett's injury happened during a play where he got tackled
Pickett was doing well in the second half of the game after a rough start
Mitch Trubisky replaced Pickett after he got hurt
Two other players, Pat Freiermuth and Dan Moore Jr., also got injured during the game
Younger players had to step up to replace the injured ones
The Steelers struggled in the first half of the game