Q. Can a man greet a woman using a high-five or fist-bump salutation? How about if he is careful not to touch her hand, (he retrieves it fast, before they touch)?
A. Horav Shlomo Miller’s Shlit’a opinion is that if it is done respectfully and his hand is retrieved before she has the opportunity to rise hers, or at least they don’t touch, in need it is permitted.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a