User blog comment:Zack Tan/Volume 7 Intermission/@comment-26968629-20150908025908/@comment-26932361-20150908031311

No he can't, the reason why he didn't leave the guild base is because of that weapon being in there, he didn't want it falling into the wrong hands so he is guarding the floating castle for that reason, if he really could use it then he simply should've taken it and went away.