From Lua's perspective, it was as though there was a lightshow happening before his eyes. The blades clashing created sparks, which Lua was only able to catch glimpses of every now and then. However, something was disturbing him. Mere seconds ago, it appeared as though Archibald was definitely going to be the victor in this battle. However, right now, they were going toe to toe without Ars being pushed back.
There were two possible explanations for this - it was either that Ars had gotten stronger, or Archibald had gotten weaker. Possibly, there was a third option where Archibald had intentionally made himself weaker to have more fun out of this fight.