Four students in Hollidaysburg, Pennsylvania, reacted when their school bus began drifting during an after-school trip and the driver suffered a medical episode.

Jenna Anderson called 911, while Skyla Horton pulled the parking brake and opened the doors. Travis Zerby used the bus radio, and Alexis Smith applied the foot brake and checked the driver's pulse.

The school district released video of the moment. WTAJ reported that the students drew on health and medical science training from school.

The driver recovered, received medical clearance and returned to his route. School leaders also praised the other students on board for staying calm and helping.