Holy priest casting Vampiric Touch

Was looking at healer damage made, wondered how a holy priest is doing 1.4m on Kenny G. Funny how he is casting shadow spells. How does that work?
https://www.warcraftlogs.com/reports/FCbXcqtNAJBwyRvh#fight=19&type=damage-done&pins=0%24Separate%24%23244F4B%24damage%240%240.0.0.Any%24129281924.0.0.Priest%24true%240.0.0.Any%24false%240