believe this describes people who have already jumped of the fence unto the wrong side, NOT undecideds.
 

II Thes. 2:9-12

9: Even him, whose coming is after the working of Satan with all power and signs and lying wonders,
10: And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
11: And for this cause God shall send them strong delusion, that they should believe a lie:
12: That they all might be damned who believed not the truth, but had pleasure in unrighteousness.

YBIC
Bill Petrovic