[quote=@Ariamis]
I would like to mention that while line of sight is important for the purposes of aiming, it doesn't mean it's impossible to hit something even if it's obstructed by something before it, as what happened with the sniper in Joppa.
[/quote]

If Serah engages the tentacle beast, there's no way the squad behind it is going to be able to be fired upon. My reasoning is that there's two bodies in the way, and if Serah slashes it in half the rubble would cover the LoS. 

Unless the tentacle was crouching and Eiswolf's sniper rifle is charged up enough to fire off a shot before AA-XOTRY moves, I don't see a realistic scenario in which Eiswolf hits that squad.