Rules FAQ
If Quentyn is killed while his strength is zero (by Dracarys or Crown of Gold, for example), you cannot trigger his interrupt because nothing will have a lower strength. (Quite the Nedly ability if you ask me. )
New official ruling: Quentyn's interrupt triggers while he is still at full strength, before the entire "gets -4 STR and is killed if his STR is 0" effect affects him.
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mplain
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Disregard the above comment. FAQ v1.2 reversed that ruling. The ruling in the Rules FAQ entry is correct.
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mplain
238