WARNING: This story contains details of a violent attack.

Angela Light sat on the floor of her school’s main office, unsure if she would live or die. 

A colleague held pressure on her wound as she bled profusely. 

The high school administrative assistant in Bedford, N.S., had just been stabbed in the back by a student armed with a knife, and all she could think about was trying to stay alive while waiting for first responders to arrive.

She used her smart watch to call her mother. Her father picked…