Explosives Expert + Summon Skitterbots + Burning Legion Support

Are enemies near skitterbots linked with burning legion already considered to be burning?
Or do they need to take a critical strike from the fire damage to be inflicted with burning ailment?
If it's latter, is the extra mana reservation worth it for occasional +30% crit multiplier?

Burn and Ignite are 2 different words.
You can burn without being ignited (burning legion, fire trap, flame dash, righteous fire...)and it will proc Explosives Expert.


Are 30% crit multi worthing more mana reservation ?

I don't think so, because IMO it's easier to ignite targets (and make them burn) with any crit fire damage you can add on your main skill instead of reserving more mana~