I would shoot in both situations, providing the fawn didn't have spots. The fawn should be weaned by hunting season, so the only thing left is an emotional bond. The buck, heck if its legal, I'll take it. Really makes no difference to me. I shot my cow elk this year. She had a calf at her side, and that thing hung around forever before it finally went away with the herd. I didn't hurt anything by shooting the mamma.