The two events are most likely independent of each other, but that won't stop him from being suspicious.
However, it it didn't matter if he believed it because he had been instructed to accept Amelia and get on with things as if nothing happened to him.
So even if Amelia had returned with a shoddy and unbelievable excuse, he would have still accepted her back in the group and continued with what they were doing.
Legion watched as Amelia was given entry past the defenses of the base. They couldn't see anything from where they were, so they didn't know exactly what had happened in the base.
They didn't know what Amelia was asked or what excuse she gave for her absence. This lack of awareness didn't sit right with them. They didn't like it at all.
Legion-4 tsked in annoyance and said, "This is the shortcoming of the pathway of slavery. There is no way to ensure loyalty when we are just starting out in the pathway."