everyone has ideas that get shut down by the gm. if you play long enough, eventually you'll throw an idea that doesn't work. it sounds like your player has a much higher percentage of ideas that need to be shut down which is fine. for example, jumping up and stabbing a mech can result in many possible mechanics. the katana doesn't breach, he takes damage for falling awkwardly. his katana breaches, the forces snap the weapon in half. many actions don't make sense, this is common. that's most of the fun of the game - trying solutions within the game mechanics to solve a problem. if he's not playing the same game, it should have the consequences of what the game mechanics prescribe. trying to play baseball in a football game simply results in a lot of fouls. but you can be creative about it in a fun way. i attempt to teleport. the teleport fails, but the effort causes a brown stain to appear on the back of the pants. the faint smell of feces now pervades the area.
