Just give me a second!

Saferoom one-action Spell 4

Manipulate Earth
Traditions arcane

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You shape a box of stone around your space. You create a 5-inch-think box of stone around your 5-foot-space, or what ever sized space you occupy. The box has AC 10, Hardness 14, 50 hit points, and is immune to critical hits and precision damage. It lasts until the start or end of your next turn, your choice, and is air tight allowing you to breath comfortably the air that was in your location during your turn.. Upon taking its total hit points in damage, it falls into pebbles and disappears. You can choose to make a one way viewing window when you make this box.

Thoughts?