Quick way to NPC Magic?, is there a way to speed NPC casting up? Options

[Clank]

I recently ran a SR game where the group was being attacked by mages. I had an NPC in the party and felt it would be unfair if I only picked on the PC's. What ended up happening is that I slowed down combat b/c I was rolling the Enemy's Sorcery, then the NPC's Resist, then the Enemy's Drain. Near the end of battle I just had one of the PCs make the resist test so they weren't just watching me roll dice and say, "Ooo, that was close." I don't really wanna just make up test results b/c I don't want to give the PCs the battle, but neither to do I wanna cheat them out by just deciding that the NPC takes Light drain. I also thought about rolling two sets of dice at the same time (white for Sorcery, black for drain), but that seems like a lot to roll at once. Any suggestions?