Verified for patch 16.8.1

Emergency Shielding

At 40% Health, gain a 50% max Health shield that decays over 2.5 seconds.

Source

Factory New

Effects

Duration: 2.5
PercentMaxHealthShield: 0.5
TriggerHealth: 0.4

Emergency Shielding enables

Shield On the Menu

Grants temporary HP that absorbs damage before the unit's real Health is touched.