This is insane, but:
Connect a firewire cable between the machines.
Feed the DVD into your secondary mac and boot it while holding down the letter 'T'. This should start it in firewire disc mode. You should see a big firewire icon on the desktop.
Boot the target one and hold down Option; it should show the other mac in firewire disc mode as a boot selection. Choose the DVD drive, and pray like hell.
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