Focusing on who would be stronger with light elemental mana was not the goal Walker had though. Instead, he was supposed to be patrolling. However, he didn't see any issue in using the patrol to also train since there were multiple other patrol groups around along with the ship being very close by.
"I would say my light blade is less condensed compared to yours but I should be able to control it." Walker made a motion with his hands and the light blade he had created in the air was moved with it. "I just can't hold it like it's nothing. I need to manipulate it and use a little more mana to do so. Yours is easily held because of your song."
The intentions of Alice's singing were clearly an important aspect of her skills. Because she sang with the intention that the light blade she had created would be a held sword, then it was unable to harm the person holding it. Walker's was a different story.