I don't think that's a metaphor. He (John or Tom - I can't figure out the plot) calls around (ie, visits the other guys place), and he is wet to the skin. It has been raining, for example, and the water has saturated his clothes. He is wet from the outside and down to his skin. Does that fit the context?
"He has already lost a sound reason to him..." is meaningless.
Student or Learner