NEW : High school football coach had been on vacation with students to South Carolina . A 10-inch - long black man killed by sparks from fire extinguisher . Was treated at hospital ; bite reportedly not life - threatening .
NEW : High school rowing coach had been on trip with students to South Carolina . A 10-inch-long diamondback rattlesnake killed by blast from fire extinguisher . Victim treated at hospital ; bite reportedly not life-threatening .