orgasm/ejaculation out of sync

i've read and heard before that somehow when a man ejaculates, that doesn't necessarily mean orgasm, and an orgasm can go without ejaculation as well, but i never pictured it just because the two always happened simultaneously for me. well, last night my girl was doing a blowjob on me and when it got intense, i pulled her head away and squirted ejaculate all over my belly. suddenly i realised "that's not all" as if i didn't come... it took a few more hand slides and then i felt orgasm. that felt very weird, it's as if you've just boarded the train and the train takes off, but for some reason you're still on the platform... has that ever happened to anyone? i was caught by surprise, so i don't remember how high i felt when i was shooting come out, but i do remember that the orgasm felt good... any thoughts?