[there's a moment of confusion on his face as the memory starts— and it doesn't take long before it's replaced by worry, then anger.
His expression changes aren't quite done though, because after that? His face goes completely pale and he looks absolutely desperate. And that's the expression that stays on as his eyes widen in shock and he collapses on his knees-- his legs no longer able to support him at all.
After just a moment of pause, he starts trembling and there's a scream here-- definitely not something that says "GOOD MEMORY". Although the memory is over, he doesn't seem to be really aware of his surroundings right now]