User blog comment:Hayashi H/Spring 2016 Event Guide/@comment-211.31.21.11-20160523175637/@comment-26486243-20160524064404

Yes. By exactly I meant that there's no additional benefit to intentionally LBASing that node more than once, since once is all you need to trigger the debuff. But there is no drawback if you S-ranked again later on or anything.