Syren was in the swimming pool,the whole area was full of water,,she had become akumatized by Hawk Moth since she was devistated the boy she had a crush on,aka Kim didn't accept her feelings,she spoke to herself

"Once kim's in here...he'll be mine forever...!" She'd speak to herself,smiling happily,little did she know,you,Gabriel aka hawk moth's assistant was there,you weren't exactly hawk moths helper,morso Nathalie's helper..but you where also his helper,but you where an anti hero...