Fighters like Rodtang Jitmuangnon have granite chins truly, but even with proper training and neck exercises like Anthony Joshua, it sometimes is not enough which is what Ilia Topuria proved with Max Holloway in their fight. Max lost his granite chin taking a bomb from Ilia. The result was KO knockout. This is what we see here. The man in grey pants truly trusts his chin, but it's just not enough when the man in blue decides to throw a precise and powerful haymaker.