Encouraged by Alicia's words, Alice and Claire fight Isaacs, who is eventually killed by his own clone--the one Alice had encountered en route to the city--and Alice releases the antivirus, killing the undead.
Encouraged by Alicia's words, Alice and Claire fight Isaacs. She dodges the lasers, and survives, then defeating Issacs, who is eventually killed by his own clone--the one Alice had encountered en route to the city--and Alice releases the antivirus, killing the undead.