The first time they shot Haldir's death scene was a disaster.
As planned, Viggo ran to catch Craig when he fell, only to discover a face that didn't look nearly as dead as it should have done. Craig looked positively mischievous, in fact. Light blue eyes met darker, and Viggo was mesmerised by what he saw there - interest, an invitation, lust?
Neither man heard Peter shouting at them, until he actually walked up and kicked Craig lightly in the leg, and both snapped to attention.
Later that night, in Viggo's trailer, Craig followed through on his promise.