Not the ideal release obviously, but this is an English subtitled file of the 2015 short "The・Ultraman: Jackal vs. Ultraman", shown as the Japan Animator Expo and an adaptation of sorts of the manga by Mamoru Uchiyama. This file was originally on Archive, but I saw that it had been taken down quite recently, so I'm uploading it here since I happened to have it downloaded and I want to avoid the subs being lost (for the life of me, I can't find it anywhere else). Unfortunately, I do not know who actually put in the work to subtitle this, otherwise I would credit them here.