I considered calling this chapter "Maternal Instinct", as tribute to a review I got from Raberba girl which called Axel's protectiveness of Roxas his "maternal instincts"... I couldn;t stop grinning. Lately, has been making my late-night review scourings XD If you guys bother to read this part at the top, you should check her out. She writes great KH stuff -especially Sora's Job Hunt.
Instinct
There were times when Axel questioned if he really did have a heart, and that all this Heartless crap was a waste of time. If not, then maybe fear wasn't an emotion.
Fear was something Nobodies remembered, sure, but in order to act like you were afraid, you had to think about it. When Roxas or Xion cried out behind him on a mission, he didn't have to remember to turn around. When Xion slipped from the clock tower and Roxas grabbed her, he didn't think to "Turn On" his fear as he'd reached for Roxas's legs. He'd just acted.
I'm not sure if Axel grabbed Roxas when Xion fell from the clock tower... He did in the KH Novels... That's good enough for me!