Leo discovers that Spyroach is targeting Raph and chases him until it gets caught in the wet cement, but Spyroach molts its skin and emerges in a second form which it can now fly.
Spyroach is targeting Raph. Spyroach chases him. It gets caught in the wet cement. Leo discovers this. Spyroach molts its skin. Spyroach emerges in a second form. It can now fly this second form.