Out of topic, if I understand correctly, PIE *bʰewg- gave anc.gre. φεύγω. Another source (utexas.edu) for same root gives greek reflex phobos. Is there any sense/is it obvious/sound natural that Greek "running away" contains that it is from "fear", as in Slavic noun fear = STRAH is reflex of PIE *ter-, PSL straxъ (it is "learned" that we run away out of fear)