Meeting an acquaintance
Souta could understand why Heili didn't want to go to the ancient ruin. Several powerful factions that were stronger than Mince Hand were trying to get a piece of ancient ruins. Yet, Souta wanted to fight for it with the two of them. It would be suicide if they offended those factions.
Souta didn't explain further to her. With his current strength, he wasn't afraid of anyone under the Great Shackle. Heili doesn't need to know it.
Heili's power level was decent at the intermediate B-rank. The only problem was she was pretty old. If he wasn't wrong, she was twenty four years old this year. Even the Core Disciple Neiso was twenty-seven this year.
Lumilia and the rest were only nineteen this year. Yanagi and the third years should be twenty-one this year. Yanagi was already a peak A-rank at that time in school and after the incident regarding the Deadly Sins, she broke through S-rank easily. When Heili was twenty one she was probably at C-rank.