Instant fatigue DMG just when bar appears

[Masterchiken]

Description: i died on hardcore charecter while swimming on the vile reef in straglethorn over a fissure in the water while killing murlocs, the bar of fatigue just appeared and i took heavy dmg i died in like 4 seconds since fatigue appeared

How to reproduce: swin over the lower strip that crosses the vile reef near the murlocks, fatigue bar should appear after a while

How it should work: when fatigue bar appears you take instant damage even while it has time left

Database links:

[UltraNix]

@Masterchiken What is the exact spot?