I have seen shippers claim that Lon'qu/Lissa is canon because arrows are mentioned in Owain/Father and Lon'qu/Lissa. There's nothing wrong with using this to justify Lon'qu/Lissa, but it also justifies Frederick/Lissa, who mention dodging arrows in their B. I think it's ironic that Frederick, who teaches Lissa and presumably Owain how to dodge, would do an anti-dodge and die for Owain. This story takes place between Frederick/Lissa A and S.
"Frederick!" Lissa called as she ran through the camp. "Frederick! Where are you?!"
"My lady, is everything alright?" Frederick rushed out to meet her. He was alarmed by the princess's noisy outburst through the camp.
"I found a great spot for relaxing!" Lissa exclaimed. She began tugging Frederick's arm. "C'mon!"
Frederick looked mildly annoyed. All that commotion over something so trivial.
"Today is a training day, my lady," Frederick gently reminded her, without a trace of annoyance in his voice.
"Aww…" Lissa sighed and her shoulders slumped with disappointment.
Frederick offered her his arm and began leading her to the training grounds.
"If you do well today, I will consider letting you stop training early, so that you can enjoy your spot," Frederick offered, hoping that her mood would improve. He hated seeing her looking downcast.
"It's fine, Frederick," Lissa replied. "We made an agreement to split our time between training and downtime. It'll have to wait until tomorrow."
"Very well, my lady. Today, we will practice dodging arrows," Frederick said.
They had reached the grounds at last. Lissa let go of Frederick's arm and waited for him to start. He picked up an iron bow and a quiver of blunt, harmless training arrows. Frederick had little to no skill with the bow, but it was important for Lissa to learn how to reliably dodge arrows, especially since she had shown some interest in being a pegasus rider.
"Are you ready, my lady?" Frederick asked.
"I think so," Lissa responded.
"I will call out directions and that is the way you should move," Frederick said.
Frederick nocked an arrow and drew back the bowstring, picturing how Virion would take an archer's stance and tried to do the same.
"Left!" Frederick called out and let it fly.
Lissa moved right into the arrow's path. She let out a surprised sound as it bounced off of her.
"Are you alright, my lady?" Frederick asked. He put down the bow and began walking towards her.
"Frederick, just keep going," Lissa said. "It won't do for you to check on me every time I mess up."
"Yes, my lady," Frederick nodded and took up the bow again.
"Left."
"Right."
"Down."
"Right."
"Right."
This went on for some time and Lissa began to rarely miss a dodge. Eventually, Frederick ceased calling directions, yet Lissa still dodged.
"Excellent, my lady," Frederick praised. He set down the bow and the empty quiver. "Next time, I'll ask Sumia or Cordelia to lend you a pegasus. If you are to be a flier, you must be able to keep yourself and the animal from harm."
"Thanks, Frederick," Lissa said, smiling. "Tomorrow, I'll show you the place I found."
"I look forward to seeing this place. Perhaps, we could also stop in a nearby town for some shopping?" Frederick inquired.
"No errands on relaxation days," Lissa scolded him.
"I need to purchase something personal," Frederick explained. "It's not related to the Shepherds."
"I suppose it's okay then," Lissa conceded. "But you'll try to make it quick?"
"Yes, my lady," Frederick answered.