Anastasia was just examining it before she went about working on getting it cleaned up. Although she was just musing, "How did it end up this infected? The salve should have prevented against this...." Yet she was mumbling to herself that perhaps she had messed something up, that she had mixed something wrong. No all of the fault falling on her shoulders. When it was just something that happened; it could have been something that he had done as well without realizing it. When cleaning the wound, there could have been a small part of the cut that he missed. And just that small bit could cause a problem.