Ezra Grimm

Stratholme
From the main gate, clear the streets toward Festival Lane and Market Row without crossing the next arch during an existing pull. The Unforgiven ambush brings Vengeful Phantoms into the street. Check for Hearthsinger Forresten and Skul while travelling, but do not depend on either rare appearing. Ezra Grimm's tobacco box and the postboxes are deliberate side encounters; clear their surroundings before interacting.
Ezra Grimm
Elite UndeadEzra Grimm turns the tobacco-box detour into a frontal fire fight with a nearby stun, so the box must be approached from an already-cleared street.
Abilities

Flame Breath
Flame Breath hits a frontal cone. Point Ezra into cleared space and keep other players behind or beside the boss.

Smoke Bomb
Casts a smoke bomb, stunning nearby enemies for 4 seconds.
Smoke Bomb stuns nearby enemies. Keep the healer back so the stun does not remove healing at the same time that the tank cannot act.
Tank- Take Ezra as soon as the tobacco-box encounter starts and direct Flame Breath into the cleared street. Keep the healer out of that cone and away from the nearby Smoke Bomb stun.
Healer- Heal from behind or beside Ezra at range, outside the frontal breath. Keep the tank healthy before Smoke Bomb instead of standing close enough to be stunned with the melee group.
Damage- Let the tank turn Ezra before committing melee damage. Stay out of the Flame Breath cone and leave the healer separate from the players exposed to Smoke Bomb.