My sebae anemone has jettisoned a tenticle

Hello everyone, I have a question about an odd behavior from my sabae. Today he cut a tenticle loose and it is floating around my tank...The tenticle is still puffy like the rest, and appers to be closed at the base. It is not deflated or limp, in fact it is quite fat and bouyant...
The sabae is humongous....as much as 18" across at times. With tentacles about 2 to 5 " It also has a pair of mated perc clowns which have been laying eggs like mad.
The anemone has been healthy and has not moved its foot in over a year.
Is this abnormal? Is this how they propagate? Just wondering if im in trouble or if im gonna have more anemones or what....
Thanks for any assistance/advice
 
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