In Reinhardt's opinion, Frisk absolutely is deserving. Granted, he doesn't know much about them, or about their odd friend. But he's always been one just to follow his heart. And here, his heart says to offer support.

I will be your shield.

Even if it's just to offer an embrace.

"It is all right, my friend. If you have tears to shed, no one will see." A beat and a huff of laughter. "I am too big to see around."