There was blood in the hallway and children were covered in it, one of the students who survived the mass shooting at Robb Elementary School in Uvalde, Texas, told ABC News. "[The shooter] came in and said, 'You're all gonna die,' and just started shooting," Samuel Salinas, 10, recalled in an interview airing Friday on "Good Morning America." MORE: https://abc7.com/texas-school-shooting-survivor-played-dead-uvalde-tx-student/11900363/