The rule has changed from last year WP, so comparing last year to this is void. Last year the bumping player had all the onus not to make head high contact even if it was accidental. This year, like in the Thomas case, if the bump is legal and heads accidentally clash then it's considered an accident. No suspention.. That's why last week Ryder and that other bogan from the Bombers both got weeks. Both their bumps hit the opponents high and deliberate.
When did it change, when did they announce the change? Not trying argue for the sake of it; I am being serious
It seems it only changed after the MRP didn't penalise Thomas. Up until that point everyone (media, players, coaches and fans) thought what he did was reportable and warranrted a suspension. Maybe it isn't the rule that's changed just they way they enforce it