Every time I hear the words "Roll for initiative" with this GM, my body shakes and I start to sweat profusely. And that's something I respect and that I love, specially since I like optimizing my characters, with this GM I always feel like we are against a worthy challenge in a combat where every decision could mean the difference between life and death. This also extends to social interactions and puzzles, puzzles are complex and unique and you never know if that npc that says is in the good faction actually is unless you make sure to piece the entire social puzzle.