Tyros would quickly step back, before dashing forward again. As Astartes they could move and fight much faster than a regular human. As Primaris, they could do much more than that.
Even though, things might have seemed almost practice for the two, any normal Han watching would see it simply as giants suddenly speeding and withdrawing at that. In the end, it came down to flexibility and the sword could much more easily be used several instances.
Thus it didn't take long before Tyros managed to draw a drop of blood from the Chaplain' hand at that. "First blood!" he declared, before ceasing his attacks.