Judging by Kate's reaction, the touch upon her knee was a good one, and not something that resulted in pure awkwardness nor confusion. Once more, Sara couldn't remember the last time she herself had ever received such gestures; she didn't even know how long it has actually been. As far as she knew, her cousin wasn't the very intimate/affectionate-type, and Armin, well....he didn't even know that his biological relation with the lieutenant was even profound. Judging by how much she has been telling the brunette beside her, that kind of knowledge won't stay hidden forever, even in times such as war. The white-haired woman looked down towards her hand, that sat upon that sat upon Kate's leg; the further she went into her own thinking, the more of a headache came into being, when she tried to remember. 

[i]'Don't let your own thinking get in the way of what is at stake. It will come to you, Sara. Whether if that meant being in the battlefield, or outside of it'.[/i]

This was one of things that the Commander had started to tell her, with Levi having to tell her something that was similar. She couldn't let her preoccupation of discovering her past get in the way of the conflicts that arise. They only had her in the high rankings, mainly because of her skill, as well as the secret, that remained hidden between only three individuals. As the years have passed, since her recruitment, Sara had tried to remember anything that was reminiscent to her own childhood; any sort of reminder...just [i]anything.[/i] It became a source of concern for Erwin, especially in regard of his lieutenant being able to find sleep, as well as the energy inside the chain of command. 

[color=00aeef]"Is it too late for me to say that I am sorry? For your loss, I mean?"[/color]

She asked, although her voice sounded more solemn, almost-depressing than usual, which was almost nearly unusual for someone like Sara. Although at this point, it may be only Kate, who may not find the Angel to be so intimidating or fearsome, considering with how personal they were able to get, as of this moment. 
Perhaps she was only lonely? Or, just as oppressed as the other? 

[color=00aeef]"Lean on me, just for a moment."[/color]

She said, without a second thought, like as if her mouth moved first before her brain. It was the instinct of comforting the younger, mainly to put reality in her eyes. Whether if this request, was something that was out of emotion, or just plain instinct alone, Sara put her point across. 

[color=00aeef]"Tell me: Do you know what it took for us to get this far? In Humanity's desperation to survive? How long have you been alive? What told you to keep living? [i]Who[/i] told you to keep going? What and who told you to fight, Katherine?"[/color]