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The Knight Brace may have been designed (By the Ultraman King) to be meant for sword combat, unlike Mebius which is an all around based device. The fact Tsurugi's device is called the Knight Brace shows it's meant for sword based combat. Plus Tsurugi was amped up with the power of the Armor of Vengence, giving him a power boost Mebius didn't have.
I think I can explain this. Mebius may have planned to do that when he lifted up Bogalmons...but Tsurugi didn't care about the safety of those around for the logic if it isn't killed then, more may die later. But yeah.
if mebius changed to mode 2 hunter knight strugi will dieeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee forever!!!!!!!!!!!! muahahahahahahahahahahaahahahahahahhahahaha!!!!!