Normally I wouldn't enjoy being negative, but I'm a little concerned about the amount of healing done by the shadowpriest with renew and shielding.
It reminds me of guilds using enhancement shammies to heal on Vezax back in ulduar. Just because they were healing as a dps class doesn't mean they were not healers, and the priest is using a lot of healing spells to cover for the paladin.
The impressive part should be seen as the time and the push, rather than as a "solo heal." So I will congratulate you on using only one healer (rather than claiming it as a solo heal) to get the push for a quick kill.