Ikkaku heard Raven's scoff but doesn't see anything much when he looks around. Ikkaku at that time doesn't know why anyone would think badly of the soul society but at the time and place all Ikkaku can think about is how to ease up Mariko's doubts. Ikkaku then says to Mariko to reasure her "Trust me. Nothing bad will happen to you there. It's a really peaceful and wonderful place to live in. And you'll have the highest level of protection provided should you need it."
Karin meanwhile as she's heading back home following behind her brother, them being two blocks away from the clinic, thinks about not only the drama Yuzu is going to give them, but also the drama their dad is going to unleash, knowing how he always acted when Ichigo was even a minute late. She also is concerned whether another hollow might show up or not, having already sensed two emerge in the past hour, having fought one of the two hollows down, and having seen two of Ichigo's friends, Ikkaku whom they spoke with, and Renji who she saw through the window of the downtown Karakura coffee shop, as well as sensing the pressures of the many other soul reapers in that area all at once.