Oh, that is cute. I hope the little dumpling figures it out.she/he is the only one out of 6 that can not get her/his little button to go under for a dive in the water. She/he trys so hard. She/he got it once but couldn't do it again. She/he I think got so excited about it that she/he forgot how she/he did it.
As for Wobs, I think it's a mix of jealousy, hormones and territorial behavior. He had total run of the house for nearly two years before lil' Bean came along, it'll just take time and patience, is all. The occasional butt nip is leaps ahead of where they were a month ago when he'd viciously grab onto her!