Afterwards, when Booker attempts to pull her out, he discovers she (as he feared) is a Little Sister. Booker is shocked and when he aggressively tries pulling her out again, she calls for her Bouncer Big Daddy, whom then attacks Booker with his drill. Booker and Elizabeth engage the Big Daddy and manage to kill him, allowing Booker to attempt to reason with Sally, but to no avail. Booker, struggling to recover his daughter, recalls previous memories of his earlier attempts to do so, but in another universe. In a flashback, Booker is revealed to actually be a regretful Comstock, who bargained with Robert and Rosalind Lutece to steal another Booker's child, but ended up killing the child (her head split between dimensions) in his fight to take her. Booker (Comstock) comes to, realizing he had the Lutece twins remove his memories and move him to Rapture. Having regained all these memories, he now knows the Elizabeth that hired him is the Elizabeth from the Infinite dimension. Comstock apologizes to her, but she does not accept, instead promises he will be sorry, and he is impaled by a Big Daddy's drill. Comstock screams in pain as the screen fades to black, thus concluding Episode 1.
source:
Burial at Sea - Episode 1 - The BioShock Wiki - BioShock, BioShock 2, BioShock Infinite, news, guides, and more
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