No matter if it was his past life or this one, Charles experienced Fighting Spirit for the first time.
However, it wasn't the Knight's Fighting Spirit of the Human Race, but the Bloodthirsty Fighting Spirit of the Beast Tribe.
Bloody Glory belonged to the overall category of Fel Energy. Although close to Fighting Spirit, it was not Fighting Spirit, and when he converted Bloody Glory into the Asiluo Clan's Stellar Battle Qi, it still wasn't Fighting Spirit.
Blood Flame Qi...
Well! Blood Flame Qi is also part of Fel Energy, not Fighting Spirit.
But Charles Mecklen wasn't so fixated. As long as he could become Transcendent, any type of path was acceptable, which is why he gave up studying Fighting Spirit during his college days to practice Bloody Glory instead.