Gift of the Ox PTR Chen Question



I have a question regarding the Gift of the Ox talent of the Chen rework on PTR.
Could someone tell me if it increases the Immune Phase duration but 0,5 Seconds, going from 3 to 3,5, or the stagger DoT duration after that by 0,5 seconds, from 5 to 5,5 or does it increase both?
The Wording in the post is not clear on that.

Thanks and regards,


I tested it on the PTR and it looks like it increases the duration of both effects.