DaasYochid,
Yes (my rebbe and presumably newbee’s rav). However, it is only if he KNOWS that he will have taiva/pleasure from the rescue.
Sam,
Yes, at least according to the Bais Yosef. See Bais Yosef, Yoreh Deah 195, divrei hamaskil “V’kasav od b’Terumas Hadeshen” and Shulchan Aruch, Yoreh Deah 195:16-17.