Walter seems more a batsman who can bowl, I would say to him 'Go out & play with freedom', he showed briefly last night he has power & can certainly hit, so let him. If he is going to be the other way around then encourage him to bowl naturally ie don't force him to bowl flat out if he isn't effective or ,alternatively, don't force him into length & line if he loses his zip. Our bowling Coach needs to spend time with him.