Health decrease on every character when I attack Darth Sion

Can someone please explain in “Detail” in the STR raid whenever one of my characters attacks Darth Sion ... the health meter significantly decreases for every character. So what I’m not asking is when Darth Sion attacks or counter attacks... I’m asking when Darth Sion is being attacked ... the health bars of all my characters goes down without being attacked. It’s like something drains their health whenever Darth Sion is attacked!
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