Normally, Asuna would've responded quite loudly to anyone who pushed her in that manner. This time, she just allowed her hands to ball into fists while hitting the wall with one of them.

I might not have been there for him then...but I'll be there for you now, baka Negi! If silence was golden, then Asuna would do her best to keep what she'd heard to herself. At least around Negi, anyway.