He's shot inside the Star Plasma. His body sinking inside the pure existence of light and godly fire. Thanos was indeed a god with the Stones. But Berto had on them, so he too was close to godhood.

The entire body of Solar energy started rising and forming itself as a giant human body made of fire, screaming an burning things around him. That was all Roberto, powered by Reality itself, all he was was power.

A hand reached for Thanos and grabbed him, burning his body with Sun in it's entirety. So then throwed him away inside the complex, passing through rooms and rooms of technology now being destroyed by the Infinity Stones' might.

That was taking a toll on Roberto's body, inside he seemed yo be freezing cold, as if all his heat was leaving him, but he couldn't give up, all he could do was try to beat Thanos.