I'm new to mage and have hopefully a quick question about Inferno Blast spreading dots.

If I'm dpsing a target does Inferno Blast always spread my dots to the same target?


1 2 3 4 5

If I target 2 and inferno blast it spreads to 1 and 3. If I continue targeting 2 and hit inferno blast again will it hit 4 and 5?

Followup question if I target 2 and hit inferno blast (hitting 2&3) then change my target to 3 and spread again will it spread to 4?

If anyone has any tips to maximize dps on fight like Heroic Will it would be appreciated.