If the WHM didn't know you, he should have asked for Foe instead of assuming that you should use it. On the other hand, if you see the WHM is repeatedly using Holy, you can kindly ask if he'll need Foe on the next pull. :)
As a BLM second class, I love my fellow bards. I always ask them for Foe on big pulls or bosses and they always help me as I help the group with the HP increasement.
