User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-8.28.150.75-20140210091944/@comment-1359322-20140211010314

-_- Just so you know, Saji didn't defeat Issei, he only caused Issei's loss, the one who defeated Issei is the useless Asia and Momo Hanakai. Saji only placed a line on Issei that absorbs Issei's blood to the point where he couldn't battle. Other than that, he didn't do anything, if anything it's Sona's strategy that defeated Issei. Sona cleverly used her strategy to have Saji suck blood using his Sacred Gear, Saji's determination to master blood sucking and Momo's judgement ability.