There is no mechanic to remove surprise. They're surprised til the end of their turn, and then can take reactions for the rest of the round. There's no way for a non-surprised person to get them out of surprise (especially, flavor-wise, given the immediacy of things, you can assume that an attempt to have them not be surprised, because of the rolls, is just not understand/takes too long for them to respond).
Seth R. Feldman
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