Shadowslash actually doesn't blame them, to look good in front of him, they had already done their best but they had forgotten one important thing, their group managed to survive up to this day not because of their individual strength but because of the strength of their bonds.
If they acted normally and dealt with the Blazing Lion's guards together, they would have taken down more enemies than what they currently have.
The entire journey was extremely silent, no one spoke, they are too ashamed of themselves, they cannot bring themselves to speak in front of their kind Saint powerhouse.
Blitzerg, Randy and Gray actually know that their group wouldn't achieve much after seeing how they act, they have decided not to interfere with their decision.