RedirectMatch not workding with Forward Chaining Proxy in Apache

I am trying to configure apache server as a forward proxy chaining to another (internet)proxy while at the same time including RedirectMatch directives to redirect certain urls to the local host instead of chaining to the remote proxy.

diagram
http://www.plantuml.com/plantuml/png/TP7DIiH03CVlUOhGUt6zBQMKLK4GL9O57s1s6cbXd9GqQzUtDsLBwTHwcKFoc_y7EVJgH2zV0SvynUpub45dWzQtdOkAZy93JvBCieVE-OQA_Mw_ox0iFra69pLsmjUVgjfcxqToeBE9VPCOHR56iqpevvlISHHA5YzHII8fm1G8ysgLey2B1711yKHrA-JrpQblvWzbdl_v8HE9oXZOkz1mhvRrBjBmSNfTcYLD2bm19fuGGA4dVETRXDGshvAUK_3bo92vyTRQtERzIdnSBTd_wyDu0JZOOyV_1G00

The redirect without the forward proxy chaining directives works.
The forward proxy chaining works with or without the redirect directive but if I have both the redirect and the chaining configured any url that matches the redirect returns a 404

Here is a copy of the conf

ServerRoot "c:/bin/Apache24"
Listen 81
...
Listen 8080
<VirtualHost *:8080>
RedirectMatch ".*testing.*" "http://localhost:81/test.png"
ProxyRequests On
ProxyRemote * http://theInternetProxy:8080
</VirtualHost>


Can anyone assist?

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