Mark targets -> Shield Lob main target -> Flash -> RoH combo main target -> Flash again -> RB combo 2nd and 3rd target -> Flash -> RoH 2nd til it's dead and RoH 3rd until it's dead. 3 Flashes is all you'll really need for most trash pulls (honestly you could probably do without the 3rd Flash), unless they're big (which they shouldn't be). If the first target isn't nearing death, feel free to do FB -> SB -> RoH 2nd target after your 2nd Flash, then you can go into the whole RB thing to get your MP back. I don't really remember how useful it was in the 30 area, but I know Fracture was really good for trash when I was leveling up. As long as no one's sleeping anything those dot ticks are good to keep the mobs off your healer's face.