Nice stuff Rob!!
I once saw a similar pairing of Iridiums, they occurred about 10° and 20 seconds apart. It makes you think the damn skies are just full of them!
I remember once observing M42 low in the western sky when a satellite trailed lazily across it, I tracked along with the northbound sat for a while then realised another, slightly faster, satellite was moving into the field of view, travelling in almost the same direction. I watched as the newcomer caught up, overtook, and then crossed over the flight line of the first one.
I always get a sort of "special" feeling to catch these kinds of rarer events, if that makes sense.