He simply shifted his angles so a few spikes could slow down the blade's inevitable thrust to his chest, one sacrifice as the hot blade punched a hole. Yet the mouth of spikes at the back, made by his limbs slam into the figure behind. With that kind of forward movement a few is bound to sink. Especially the one close to the previously damaged eye, this trap seems to work.
(thanks, I try to emulate Killa Bee/Kimimaro with the spikes)