Kick Fear first, then Summon Demonic Tyrant. Do not spend the interrupt on Demonbolt. Leave Felguard range before you hard-cast, or Axe Toss locks you out.

Call Dreadstalkers means Demonic Tyrant is next — that is the go you die to. Mortal Coil hits the peeler as it lands. They hide the Demonic Tyrant cast behind Demonic Gateway.

Stop your swap when Unending Resolve is up. Dark Pact is an absorb that costs their health — do not dump because they dipped. Click Demonic Gateway; do not chase it.

Fear sets up Demonic Tyrant — kick it or magic-dispel. Mortal Coil horrors the peeler; dispel it if pets are still hitting. Felguard Axe Toss stuns you so your kick never happens.

Go after Demonic Tyrant expires and the pets are crowd-controlled or dead. Unending Resolve should already be down. A kicked Summon Demonic Tyrant is a free window on the lock.

Training the warlock through Demonic Tyrant instead of crowd-controlling the pets, or hard-casting in Felguard range so Axe Toss eats your interrupt.