Rey managed to get rid of the long thorny vine created by Arthur but it was only done after a series of continuous slashes from his condensed blood sword.
When he saw the vine fall and noticed that his legs were released from the entanglement and only pain received from the thorns remained, the little boy jumped a couple of meters back while raising his blade toward Arthur and staring at him with fear and anger.
He passed five hours with Arthur and he knew that it was impossible to defeat such a monster but there may be a chance to escape if he played his cards right.
"R-Rey?"
Robin stared at what happened with wide open eyes, she couldn't believe that the little boy who seemed so fragile and weak to be able to use such strong magic. She knew more than any person how strong Arthur was, to be able to block his attacks or deflect them is no easy feat. Unfortunately, she didn't know the whole truth and that Arthur is only playing around.
'Argh! I have to escape quickly!'