March Rain would always lose HP after he casted Polymorph, then stop after one or two seconds.
Lucky Southern Persian took a deep breath and casted damage reduction on himself first to slow down the rate at which his HP bar was dropping. Then, he used his Polymorph on Moonlight, who was attacking him frantically.
Moonlight had activated his Berserk mode and was also dealing physical damage. Half of the damage that Lucky Southern Persian had taken was generated by Moonlight.
He actually wanted to Polymorph Lu Li more since he was chasing down their healer, but he also knew that Lu Li had more dispel skills than an ordinary player and wasn't an easy target.
He had to cast Polymorph on Moonlight first. At the very least, he would die slower this way.
Each spin of Moonlight's hefty axe would take out a chunk of Lucky Southern Persian's health bar.