In 30 years of training no one ever told me to train "watch" as a command in a positive way. Oh we did force it with the collar but that method never worked with my dogs. In fact it backfired with the dogs looking away, a natural reaction to make something stop.
Just for grins I've been training "watch" for treats with Lucy, something you can do in the dark of winter in the kitchen. Just like any lab she's a water cheater if she has the chance. Yesterday as she was coming back from a 30 yd water mark she drifted towards shore. I said " hay, Watch!" bang her eyes were on me. a "Doh" moment! Their body follows their head. On the third and last sort of proofing of my apparent discovery she really took a right to the shoreline. "Watch" she straightened out again. One more "watch" and she came out of the water at my feet. I think reenforcing "watch" enough that the dog always looks at you in any occasion because there is something good happening, not because they'll get burned, is a much happier way to instill that response.
Still learning after all these years.