Supermassive Black Hole Destroying Proto Star System

If the orbit comes close enough to the black hole, and if the protoplanetary disc is large enough, tidal effects will destroy the protoplanetary disc.

Question is: why hasn't this destruction happened at the previous closest pass of the black hole?

From TFA:

"The star was likely formed in the stellar ring and later thrown into its highly eccentric orbit though a close encounter with one or more stars in the ring. The stars exchanged momentum and the red dwarf was tossed onto a new, deadly trajectory. "

So, even though they're calling it an "orbit," it was likely not on this trajectory before and this is the first time it's getting close enough to the black hole for the disc to be affected. Also, the disc is already being destroyed: "But the dama

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/2L3q9_lG-MU/supermassive-black-hole-destroying-proto-star-system

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