Yeah, usually I'm on sparks and have a very similar macro I use. However, there's only 2 tanks in my guild. Me and a Paladin. The Pali wasn't around, so we had to pug what we could find (and DKs are abundant in LFG). So we just found one with suitable gear who said he could do sparks and I tanked. I tried to explain to him after the first two wipes/flub ups where it was obvious we weren't getting stacked sparks/enough DPS in phase 1 that he could make a macro to announce the spark and target it automatically/focus it then DG it. We take video of our fights and I noticed when I went back the guy was DGing IMMEDIATELY when he saw a spark. So it was first spark, death gripped. Second spark ... nothing. In other words, utter failure. I'm just glad he's not in my guild lol.