The seed coat's not clamped, it's somewhat plump with moisture, and you can see the green of the cotyledons already, so this isn't a bad helmet head - thought it's not one I'd do the pinch-and-pull method on quite yet either. I might be different than BF in that in a case like this I'll leave it domed for 24 hours or so then, then if I see more green showing under the coat, I'll try slipping it off without surgery. The green below the seed coat suggests the growth node of the seedling is already outside the seed coat, so as long as you protect against a lower break the sprout should survive. The more cotyledon you can save though, the better start the sprout will have. They can stall quite a bit if you break them off low down against the node. Also, if I leave a seedling domed for any meaningful amount of time I'm careful to let it adjust properly before it goes back under lighting of any intensity.