Liam jerked his arm back at the cut, but other than that, showed hardly any reaction to it. This would be a difficult lesson for the slave. He had only known fights, in which he would attack quick and strong to bring his enemy down as soon as possible. That is the exact technique he would use to fight a vampire, hoping to be underestimated at first, and cut him down, before the vampire realized what was happening. That's because he knew he wouldn't have a chance in a longer fight.
Liam held back on his strength, when he attacked the vampire again, focusing more on defending himself, since this time his master was actually fighting back.