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The NFL’s desire to prevent helmet-to-helmet hits seems to be having little effect on the number of devastating, concussion-inducing collisions wide receiver are seeing this season.

Defensive backs seem to have just adjusted their scopes, then gone back on their merry ways—inflicting pain. Take this hit from Indianapolis Colts corner Darius Butler on Vikings wide receiver Adam Thielen Sunday.

Although Butler got flagged on the play, there was no helmet-to-helmet contact. And Thielen ended up in the league’s concussion protocol anyway.

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The point being, Butler appeared to make every attempt at a clean hit here, and to not make any contact with Thielen’s head. No matter, though. It didn’t  lessen the impact.