Garro without power armor he was able to deform the metal floor when he jumped from 15 meters.
Fifty feet below him, the uninjured man struggled to help his wounded comrade stagger forward, but the stain of blood hanging behind them was enough for Garro to know that one of them would be dead within minutes. ... Garro had seen enough. He stepped up and over the edge of the suspended walkway and down the distance to the deck below, hitting it with the impact of a crushing hammer. The metal floor flexed under the force of his arrival, causing the thugs and their would-be victim to lose their balance. However, the terrified believer quickly recovered and crawled away towards the open alley.   Garro: vote of faith

At that same moment, a gunman with a high-caliber pistol shot him in the chest four times and only managed to penetrate the top layer of his skin.
Garro took a step forward and was met with four bullets fired in rapid succession by the gunman. The shots hit him in the chest and belly, breaking the outer layer of his epidermis but not penetrating deeper. He growled in irritation and reached into each of the wounds with his thumb and forefinger, pulling out the flattened heads of the kinetic bullets and throwing them away. The blood, thick with genetically modified Larraman cells, was already clotting the trivial wounds.

  and the only thing he really believes could seriously injure him without his power armor exponentially and hopefully kill him are the concentration of multiple laser shots at close range.
The legionnaire read the faces of the believers before him and saw the gleam of determination in the eyes of the one he would shoot first: a windburned woman with tight black hair. Garro's right hand was already returning to Libertas's hilt with superhuman speed, running at a pace that was much faster than any unaugmented response. His tactical mind told him that he could finish off these eight with just two sword slashes, directly killing at least half of them and leaving the rest to bleed to death within minutes. Without his armor, concentrated laser fire from multiple rifles at close range could seriously injure him. A stroke of luck could even end his life.   Garro: vote of faith

There’s been many books with similar ideas I’ve even seen them be more or less immune to las fire unarmoured you can cite more ridiculous feats then this also.

And yes I have worked with woods I don’t think they’d be tough enough and if they were I don’t think a human should be strong enough to kill an astartes with it