"People can flip on a dime, this situation was so quick and so crazy," Detroit Fire Union Chief Mike Nevin said, describing the dangerous scene his fire crew faced Saturday night.
They were called to Arizona Street for a man in his 50s who had a possible heart attack. When medics arrived they started CPR. But what played out next, was far from over.
"While they were doing CPR, an irate civilian started to punch the walls, wanted to see the victim and then it led to a pretty disruptive scene," Nevin said.
We're told 26-year-old Darius Calhoun was out of control - dragged a woman who was in the house at the time into a bedroom where he began stabbing her 15 times.
Calhoun is now wanted by police as a suspect in the stabbing.
Medics heard the violent assault and instead of going on the radio to alert the suspect, the man went outside and dialed dispatch.