Tsugumi realized that she and Ayase wouldn't be able to do anything. It was clear that even though they're both not fond of the way he's been acting, Ayase wanted to go out and save him. Tsugumi correctly identified that Arisa and the others would kill Ayase. Without an Endlave or Shuu's assistance, she's still fairly helpless. Tsugumi had a look of concern, not determination. She may have even been thinking the same thing, but there's only so much she can do with robots.
That changed when they both saw Gai. They were shocked though, not filled with adoration like Arisa the Whore, so we don't know where they stand now