Where in the scriptures does it say that if someone speaks a language different from your congregation, even if you and the householder speak a language that you both know well, that they should DENY you the lifesaving message they offer?
If JW's believe they have the truth and deny you the message because of this made up rule, they personally, and the elders and policy-makers who enforce these rules are blood-guilty. Plain as day.
/EDIT This, to me, adds to the biggest problem I personally have with the Jehovah's Witness religion. They clearly serve a corporation, and not God, or even Jesus.