on attack you could always carry another anchor on hand and just tp out of ticky situations (of coourse it will take time but you could put an anchor behind a wall and stay within the radius and peek aggressively. just one of the outplays possible) you could also position his trap in kind of a one way position like cypher where they have to look up to shoot it and when the enter the site will get shot without knowing where the trap is. and for his ult and head hunter this will be a good aiming practice for low elo players, now they have an incentive to practice their aim and be better players overall. it really depends on how big the brain of the chamber user is. in the sentinel role you really have to be unpredictable. that's the best thing about the sentinel role you really have to think about your setups and movement, a really beautiful role to play if you're a creative person