Board Thread:Off Topic/@comment-26397825-20150712053515/@comment-26198742-20150801125810

Also no it's an easter egg, in normal gameplay you can run into manbat at anytime on Magami Island and once you complete the quest put him in an isolation chamber at GCPD BUT!!!! if you change the date to 10/31/15(Halloween) and graapnel around Magami island again, the jumpscare will happen again and if you go back to GCPD you'll find the isolation chamber destroyed with a secruity guard holding a rifle...so basically you put in the date in order run into manbat again but only for the jumpscare