Erza was calmer because her father did not look down on David.
This was enough of an indication that he might accept David as his son-in-law.
"Let's go!" The man apparently did not speak more, he invited them to leave.
After that, he took a step to get out of the forest.
"Dad, are you going to help?" asked Erza as she followed him with hurried steps.
"Don't get excited yet, this still needs the approval of the others," Leonardo replied in a calm tone.
This was practically a confirmation that he would help.
"Hahaha, they'll definitely agree, after all, they wouldn't dare if David went on a rampage with Excalibur." Erza suddenly laughed, making Leonardo's expression become ugly for a moment.
How threatening would it be if David used Excalibur while he was almost helpless in front of Leonardo?
This ultimately made David realize even more how great a threat Excalibur was to the Vampires.