“"Hello" calls you up, exchanges pleasantries, makes a little chit-chat. A minute into the conversation, things take a turn; suddenly, you and Mantles frontman Mike Oliveres are working out plans for an escape. Taken from the San Fran garage-dwellers' sophomore set, Long Enough to Leave (out June 18 via Slumberland), "Hello" is an easygoing tune with a restless spirit, a getaway route plotted out o”