Plus ... besides Hotch not being able to see Haley or Jack, and not knowing where they are .... there's always the fear that because he doesn't know where they are, he can't help them/protect them, because he can't be there to protect them, especially if he has warning that Foyet is going after them. He can't know whether Foyet finds out where Haley and Jack ... until its after the fact.
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Plus ... besides Hotch not being able to see Haley or Jack, and not knowing where they are .... there's always the fear that because he doesn't know where they are, he can't help them/protect them, because he can't be there to protect them, especially if he has warning that Foyet is going after them. He can't know whether Foyet finds out where Haley and Jack ... until its after the fact.