He'd been getting cocky. By the time Donnie realizes what Red Hood's got in his hand as he blocks the first sword, it's a second too late.

"....."

...it's a bit anticlimactic as the charge releases, and for a brief moment the turtle holds his breath. A second later, he's still standing.

"Titanium's only got an electrical conductivity of roughly three percent."

And then he's pushing back with the bō, trying to swing at Red Hood again.