Sam fights with all of them so that they can get used to the new power. One by one he started fighting with them. Compared to his friends, the fight between him and his parents, Gloria, Fiona, and Alena was more intense.
None of them tried to hold back during the spring session. They used their full power and wanted to injure Sam. Unfortunately in the end they were unable to do anything. One thing everybody also realizes during the sparring session. That is the bloodline pressure that Sam continuously uses on them.
Sam wanted to know if any of them would awaken the bloodline pressure skill or not. As you know this is a very effective skill that even works against a powerful monster. All those Monsters who did not have powerful bloodlines would be affected by this skill.