I don't think two grown males would be "romping and playing", bobcats are solitary most of the time and very territorial. Plus these two look different in size to me. However playing is typical pre-mating behaviour, so I hope we get your friend's photos of some cute kittens in a few months time.
(I've seen a bobcat in Sequoia National Park, but as I oh-so-slowly got my camera out it saw me and disappeared
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