boulomenon aptein roun (wanting to bind the stream) would properly be boulapteroun, and this, as I imagine, is improved into blaberon.
Beraz, "ibilerari heldu nahi diona" (to bulomenon haptein run) "bulapterun" litzateke modu zuzenenean, eta edertu ondoren deitzen zaio "kaltegarria" (blaberon), niri iruditzen zaidanez.