Emma shot something into Sebastian body which render his mutant power useless so that Kate can physically hurt Sebastian.
Kate messed around with some of Sebastian's priceless whisky.
Lockheed got his revenge by biting off Sebastian's eye.
Kate gave some poison for Sebastian to drink but he didn't die and seems to be paralyzed in a wheelchair?
All of them went to the silent council to decide on the replacements; Doug is there too.
The art was great but this is just a revenge issue.