With the troll's club still stuck to his solid aura gauntlets, Matthew purposely pushed down the bone club to the ground, making the troll lose his balance.
The troll's body tilted forward due to his hand that was still holding onto the bone club that had touched the ground. Matthew could have changed his aura gauntlets into aura blades before quickly separating the troll's head from its body probably with only a single slash depending on how tough the troll's skin and muscles are, but killing the troll in front of him is not his main goal right now.
He was currently testing out how strong the troll is and he also wanted to talk peacefully with them and tell them about the impending threat which is the humans. Hence killing the troll in front of him would defeat both purposes.
'Who would want to talk peacefully to someone that had just murdered your own kin?' He thought.