It didn't take physicality to be able to tell that the bombs hadn't gone off. The Ranger didn't have very many of them not on arrows...the pouches that held them had to have padded slots for each of them to be secured in, and those took up room. But however the creature had ensured that they did not explode, they were still there, something to be careful of. As soon as they blew, if the monster was nearby, this fight would be half over. The beast could obviously predict his standard style of attack...so what else but a nonstandard one? He whirls around the tree and materializes in front of the vampire, two hailstorm arrows nocked and loosed simultaneously before he phases back out of physicality and streaking around to another firing point.