She says as she runs to the pond to check up on their 12 year old niece. Mercury took out a crystal sword, trying to block Matt’s attacks as Spark yelled his predictions on how he was about to attack next.
Spark: A right hook!
Mercury blocks a right hook from Matt.
Spark: An uppercut!
Another block. Spark smiles a bit… maybe they could hold him off until Fox gets back until… Matt grabs Mercury’s sword and snaps it in half, to the siblings' shock. Matt then backhanded Mercury into Spark, sending them crashing into a building next to them. Eren looked around in the pond to try and find Rose but she was nowhere to be seen. But then, the pond erupts, the water parting to reveal Rose in her mania form, laughing like a maniac as she dashes back to Matt.
Rose: I’m back, dad!
Matt turns around and is hit by Rose’s tackle, which sends the two of them hurling into a different part of the city, crashing into buildings and cars along the way. Matt tries to punch her again, but Rose grabs onto his arm, crawls onto it like a feral animal, takes out her katana, and starts slashing his face. She then scurried down, went behind Matt, jumped and spinned in the air before kicking him into another building. Mercury, who was getting back up, watched the fight and tapped Spark.
Spark: huh…? Oh- oh my god is that Rose?
Mercury nods
Spark: Wow she’s going crazy! I hope she can hold onto that form until then…
Matt and Rose continued matching blows until they clashed fists. The impact of the punches blasted Eren, Spark, and Mercury back, however Eren made an energy shield around Spark and Mercury to protect them… But this made Eren hit her head hard on the concrete… She started to regenerate herself but it’s going to take longer due to the head damage.
Eren: Rose! Are you okay there?
The only response was the sound of the child laughing as she continued to fight her father. This lasted for quite a while, with each of the sides getting the upper hand every now and then, until Rose knocked Matt onto his knees. She continued laughing as she wiped the blood off her blade and ran up to Matt, about to behead him, but the sound of Eren yelling at her from the distance.
Eren: Rose! What are you doing? Are you trying to kill him?
Rose: K-kill him? My dad?
She freezes as she drops out of her mania form and looks at her
Rose: Aw crap… I used my normal mania form instead of my control-