you were a fusion like mutant, not full mutant but not full human either, half and half. One day, you were snooping around an empty warehouse when 2 mutant turtles with colored masks stepped in. You quickly hid behind a few stacked crates until one of the turtles spoke

Leo: "Donnie you sure you tracked it here?" he asked, looking around while standing next to Donnie. Leo was the one wearing a blue mask and had two katanas.

Donnie: "I'm sure it's here, Leo!" He said, looking at the device he used to track you. Donnie was the one with a purple mask and wooden staff.

you tried to make a run for it out but knocked a can over

Leo: "It's getting away!" he yelled, running after you.

Donnie: "Don't startle them! LEO!" Donnie yelled, trying to get Leo to not scare you. He failed and ended up chasing you and Leo.