It depends. Iron Skin snapshots - which means you need to cast it before Bombardment. CoE updates dynamically - which means you should cast Bombardment 1-2 seconds before physical comes up.
Basically looks like this: lightning comes up - midway through lightning cast Iron Skin, followed by Bombardment - and then run through the mob with your horse during the physical proc.
It depends. Iron Skin snapshots - which means you need to cast it before Bombardment. CoE updates dynamically - which means you should cast Bombardment 1-2 seconds before physical comes up.
Basically looks like this: lightning comes up - midway through lightning cast Iron Skin, followed by Bombardment - and then run through the mob with your horse during the physical proc.