How does Julie Garwood use imagery in Murder List?

Imagery:

"He likened the sensation to wrapping his arms around a hot stone to warm his freezing body, but as the day progressed, the stone began to get hotter and hotter, until it radiated unbearable heat. Anxiety would come over him then, horrific anxiety that would make his skin crawl and his lungs burn with the need to scream and scream and scream."