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The sentence ending kamoshiremasen indicates possibility, without saying how high or low the possibility is - it might be low, middling or high.
The connectivity is:
mahoutsukaisamahajuubakuwotatarukamoshiremasen. "The wizard may possibly cast a binding spell."
The same sentence ending can be used to imply that the speaker is afraid of the possibility.
mahoutsukaisamahajuubakuwotatarukamoshiremasen. "(I am afraid that) the wizard may cast a binding spell." Note that this example and the previous one are the same in Japanese.
The sentence ending hazugaarimasen indicates impossibility. The implication is that there is a particular reason for this impossibility.
The connectivity is:
mahoutsukaisamanojuubakukarasaburinasanhaoureshiihazugaarimasen. "Because of the magician's binding spell, Sabrina cannot possibly be happy."