Doubt on sending hello packets on NBMA networks

[Srinivasa J Ragavan <srinivasarj at HCLTECH.COM>]

hi All,

I am a newbie to OSPF.
can anyone help me out.
this is with reference to the rfc 2328 sec. 9.5.1 whcih says
"  If the router is eligible to become Designated Router, it
            must periodically send Hello Packets to all neighbors that
            are also eligible."

but immediately in the next paragraph it says

" It must also send an Hello Packet in reply to an
            Hello Packet received from any eligible neighbor (other than
            the current Designated Router and Backup Designated Router)"

how can a non eligible router get a hello from a eligibe router if the
eligible router is not going to send(tatz what the first argument says)

Am i missing something here??

thanks
Srini