Even if that is a bathroom, I guess there's no other choice but to pick that. Also, Fleur already pulled onto my hand and led me towards it.
While the Noxians and the Dark World denizens were still unaware that there were two Transcendents creeping up behind them, we arrived in front of the small room Fleur pointed without any trouble.
Hikari and the others were supposed to steal that artifact but if it's always like this where a whole lot of the enemies were standing guard or sitting around, whatever it was that they were doing, it's impossible for Hikari's group to swipe it from them.
Did Arland consider those lower than Transcendents when he was cooking up his plan? Or is it one of the things he ended up neglecting?
If they really managed to swipe it, or at least they managed to reach this roof, they would inevitably be put into a dangerous situation where someone or all of them have the possibility to die.