The two would seem to be somewhat incompatible. A 'sigh of relief' I would take to be the release of tension, not in and of itself tense. " That would make more sense to me.
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KJinCali79Are you sure that it did not say "intense" instead of "tense?"Yes. I quoted from here.
RinoMaybe she is not very good at writing...I think you may be right about that. I clicked the link and there are several other errors throughout the page.