While 2 EEs were riding work deck below chippy, a hose blew on hoist & it began to unreel. Hoist operator hit E-Stop. 1 EE on chippy work deck lost his balance & struck a divider injuring back. He was taken to a hospital to be checked out, given shot for pain, & released to full work duty. Hose blew @ 5PM, @ 5:22 evac called, @ 5:25 MSHA called, @ 6:00 all EEs out of mine.