
His engage can reach you if you stand in melee range.
Keep distance from his engage and heal the teammate he pressures from cover. Do not walk into melee range to retrieve leeches.

The full version of the quick answer.
Keep the teammate doing the fighting alive, collect leeches to strengthen your sustain, and use fear to protect your team or push enemies out of a useful position.
Play behind or beside your frontline, close enough to land healing shots and reach returning leeches. Use cover between heals and keep a retreat route.
Move back toward your frontline and cover. Use Lurking Terrors to discourage a dive onto you, but do not rely on it as a guaranteed escape; before its final upgrade you can still be damaged while channeling.
Timings are approximate. When teams start grouping and pushing objectives, use the next phase’s advice.
Use Leech Therapy when enemies commit to trading or stand close together, then pick up the leeches when the route is safe: the pickup heals you and builds lasting regeneration and fire rate. Keep farming and dealing damage between healing clips, because damage recovers Healing Needles charges.
Move with an ally who can hold the fight near you. Use Wretched Vapours for a planned commitment, heal the affected ally to clear the stored damage, and help them reach cover before the crash.
Keep a clear healing angle on your damage dealer, save resources for the enemy’s commitment and collect only safe leeches. Protect your own life: dying costs part of your leech stacks.
Stay near the teammate who is fighting, heal from cover and take only safe leech pickups. Contribute damage between clips to keep your charges coming back.
Heal a Vapours target before the crash; a healthy-looking health bar can hide stored damage.
Heroes that change how you play Nurse Harrow. Situational adjustments, not rankings.

His engage can reach you if you stand in melee range.
Keep distance from his engage and heal the teammate he pressures from cover. Do not walk into melee range to retrieve leeches.

She looks for isolated targets behind the fight.
Stay near protection so she cannot isolate you. Keep a safe route back to your team instead of standing alone behind the fight.

An exposed healing angle gives him repeated long-range shots.
Use cover between healing shots instead of holding the same open angle.

His hook can reach you through the same line as your ally.
Heal from an angle where the ally in front does not expose you to the same hook line. Reposition when that protection moves.
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