Potential Forwarding Loop

Hi,
The following is stated in the RFC 3768.

8.4.  Potential Forwarding Loop

   A VRRP router SHOULD not forward packets addressed to the IP
Address(es) it becomes Master for if it is not the owner.  Forwarding
these packets would result in unnecessary traffic.  Also in the case
   of LANs that receive packets they transmit (e.g., token ring) this
 can result in a forwarding loop that is only terminated when the IP
TTL expires.

...
I am confused about the above description. Since 6.4.3 already
describe: A master, .. MUST NOT accept packets addressed to the IP
address(es) associated with the virtual router if it is not the IP
address owner. I think if a VRRP router doesn't accept a packet, it
can be implied that the router doesn't forward it either.

What's the purpose of this section?
Could someone give me a concrete example about the potential forwarding loop?

 Thanks.
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