[BUG] Incorrect death strike healing during inferno blades on Baleroc

[mikihiso]

1. Current Behavior

1.1. Description

Whenever you are using death strike after being hit by inferno blade you heal for 7% of your hp, instead of 20% of damage taken in past 5 seconds

1.2. How to Reproduce

       1. Pull Baleroc
       2. Survive till inferno blade
       3. Get hit by 2 inferno blades in a row
       4. Use death strike
       5. Look at damage taken from those blades vs actual healing done by death strike

1.3 Source Material

Observed from logs (https://classic.warcraftlogs.com/reports/3WTZHaVM7c9fYdgG#fight=51&type=resources&source=7&view=events&eventstart=13428475 as example)

Screenshot from logs (20% of damage taken just from last hit is already more than healing done by death strike)

2. Expected Behavior

2.1. Description

Death strike healing should choose the damage taken component per last 5 seconds when it's more than 7% of DK's health.