Eskimos question unpenalized head hit that took QB off the field

It was like adding injury to insult.
How can a Canadian Football League injury spotter see a helmet-to-helmet hit and pull a player out of the game to undergo concussion protocol without an accompanying penalty flag from the on-field officials?
The Edmonton Eskimos were left asking the same thing Saturday, following a 25-22 loss to the Calgary Stampeders in the Labour Day rematch at Commonwealth Stadium.
“How are you going to take me out of the game for a hit to the head and there’s