2 This is my response as a player rather than a DM. I ask my friend who DM's our games a lot of homebrew questions like this so the response is based off his responses and the reasoning he gives to rejecting/excepting my proposal. I've provided evidence for the physics of my solution.
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Personally I'd say yes as the "physics" of the question makes logical sense. You are casting a freezing spell on a body of water which an entity is standing in. I'd say there are two ways to handle a controllable entity being frozen; they die or they need to make a check to break free. They'd die as a result of the water in their cells expanding and bursting the cell. See the effects of frostbite for more specific details. Inspiration for breaking free from being frozen can be drawn from the 5th ed spell Freezing Sphere:

Creatures that were swimming on the surface of frozen water are trapped in the ice. A trapped creature can use an action to make a Strength check against your spell save DC to break free.

The DC for breaking free can be copied directly from the spell or can be adjusted depending the DMs opinion of how frozen the entity is. For e.g., the Freezing Sphere spell completely envelops the target with the intention of trapping the target while your version can be viewed as a homebrew variant of it and may not do so. The extent is update for debate and is likely dependent on detailed the situation is described.

The sequence of actions will need to be checked in case there's some hidden wording/meaning that restricts it in some way. AndI cannot adequately answer this given my level of course it depends on how open-minded the DM isexperience.  

Personally I'd say yes as the "physics" of the question makes logical sense. The sequence of actions will need to be checked in case there's some hidden wording/meaning that restricts it in some way. And of course it depends on how open-minded the DM is.  

Personally I'd say yes as the "physics" of the question makes logical sense. You are casting a freezing spell on a body of water which an entity is standing in. I'd say there are two ways to handle a controllable entity being frozen; they die or they need to make a check to break free. They'd die as a result of the water in their cells expanding and bursting the cell. See the effects of frostbite for more specific details. Inspiration for breaking free from being frozen can be drawn from the 5th ed spell Freezing Sphere:

Creatures that were swimming on the surface of frozen water are trapped in the ice. A trapped creature can use an action to make a Strength check against your spell save DC to break free.

The DC for breaking free can be copied directly from the spell or can be adjusted depending the DMs opinion of how frozen the entity is. For e.g., the Freezing Sphere spell completely envelops the target with the intention of trapping the target while your version can be viewed as a homebrew variant of it and may not do so. The extent is update for debate and is likely dependent on detailed the situation is described.

The sequence of actions will need to be checked in case there's some hidden wording/meaning that restricts it in some way. I cannot adequately answer this given my level of experience.

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Personally I'd say yes as the "physics" of the question makes logical sense. The sequence of actions will need to be checked in case there's some hidden wording/meaning that restricts it in some way. And of course it depends on how open-minded the DM is.