I really don't get why people are dismissing the water manip as not a big deal. Yeah, this is a friendly spar, so obviously he's not gonna kill Kenobi with it, but it's still 4.8 Gigatons of pure striking force. And yeah, the LS is dogshit, but he doesn't need to restrain Kenobi to inhibit him, he can just toss him around in the air with very little he can really do about it, while also using the water to position Annabeth to attack blind spots or hit him while he's distracted. Precog and ESP doesn't mean he's omniscient, it's still plenty possible to catch him off guard.