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Message: <blockquote data-quote="Iku Rex" data-source="post: 5606327" data-attributes="member: 752">It's been a while since I had any physics classes, but I'm going to give this a try anyway. I don't understand what you mean by "spontaneously" in this context.Simple thought experiment with a moving train (focusing on momentum): A rock is is dropped straight down into one of the cars. The train as a whole has now gained mass. It will slow down. Right?Same train, only this time you grab and quickly yank out the rock. The train has lost mass. It will not move any faster as the rock is still moving forward as it is removed. Right? Yes, I'd like to see the math, or, more importantly, the assumptions you used to do it. I have a pile of dirt. I use a shovel to remove mass from the pile, making it smaller than before. Does this make the pile of dirt move? Why must it be different [barring special help from the magic] if I use incomprehensible magic to shrink the pile?Also, even if the spell somehow does something with conservation of momentum when it shrinks the item, it does not follow that the spell must transfer a potentially enormous amount of energy to the item as it grows back. That seems like an unnecessary complication, without any support whatsoever in the spell description. (Remember, once the item is restored the spell ends, so the magic has to do its thing before then.)</blockquote>