i come crawling back after hell on earth at work. they can totally be nerds about brooms together. she has more than a few, some she knows she doesn't actually need. and has kept a couple of her old ones for sentimental reasons. if tom has been working with/for ro during the 2018-2021 timeframe, they certainly would have met then and maybe she recognized him as *the* literal master broom artist that he is and the bonded from there