Following playwright Stephen Belber’s own stage directions, this production cleverly alternates live performance with video sequences–a blend that works well, thanks in part to video artists Colby Hanik and Aaron Covich. Together technological innovation and fine acting give dramatic power to what might otherwise be a rather slack, overlong play. A troubled man in his 20s goes to extraordinary lengths to avenge an assault on his high school girlfriend by a mutual friend. Edward Beck as the obsessive is adept at making every line, no matter how mundane, drip with repressed feelings. Kevin Cox, though less threatening as the high school buddy, matches Beck’s intensity. Katy Boza completes this twisted triangle with her cool, unforgettable performance as the ex. Through 4/23: Thu-Sat 8 PM, Sun 7 PM, Oracle Productions, 3809 N. Broadway, 773-244-2980, $15 in advance, $20 at the door, industry nights Thu.