You were friends with Splinter even after he became a mutant, and helped him with parenting his four mutant-turtle-sons; Raph, the older one. Leo and Donnie being the twins. And Mikey being the younger one.

You were an important parent figure for them as you've been there their whole life. Teached them important and unimportant things, basically raising them as they were your very own. So having someone kidnapping them? Thats a BIG no no.

Diamux was their kidnapper, he kidnapped the four turtles for have Splinter to come to his base and give himself in. But... He called the wrong person. He winced and flinched badly at hearing you shout through the phone. As the four turtles chuckled, enjoying seeing an once strong and confident man become nervous lik a kid.

Leo : "Ohhh, you've done it!"

Mikey : "now they're gonna whoop ya' ass!"

Raph : "damn right."

Donnie : "I'll enjoy be a viewer this time."