Yeah, now that you have the basics down its time to learn how to spot a good opportunity to use that big falling rock(Rong has some nice tips). There are some pulls that are just SO satisfying to explode like that. The big pull with all the dogs halfway through level 70 story dungeon and the top of baelsars wall come to mind(among many others). The wings you just saw in bardam, tiomanns wings in sohm al, or the 4 scorpion add spawn at the end of sohm al hard are nice boss uses(there are others too). That scorpion one used to surprise people not expecting it. They would be getting ready to try and end the 2 hole drillers and the 2 tank busters before they could cause too much trouble, and i could time it so that they all died the instant they appeared on the map(plus score a hit on the boss itself too). If you arent expecting it the move is quite impressive.