Ed Westfall is known for his penalty killing abilities. With 26 of his 231 regular season goals in the NHL scored while shorthanded, he was a predecessor to what they now call the "Power Kill". In 1968-69 with the Boston Bruins, he had four shorthanded markers and four game winning goals. On two occasions, his shorties were the game winners.
On February 2, 1969, the Bruins hosted the Detroit Red Wings at Boston Garden. At 9:59 of the second period, Westfall scored on Roy Edwards, assisted by Don Awrey while teammate Derek Sanderson was in the box serving a minor penalty for high sticking. The goal made the score 3-0 for the home team. The goal would hold as the game winner in the 4-2 Boston win.
Later that month, on February 27, 1969, the Bruins were on the road for a game against the Oakland Seals at the Oakland-Alameda County Coliseum Arena. 2:25 into the game, Westfall scored shorthanded on Chris Worthy, assisted by Boston goalie Ed Johnston. The goal was shorthanded with Ron Murphy in the box for hooking.
That goal was also all the Bruins needed and Westfall's shorthanded marker was the game winning goal in a 9-0 shutout. In the match, Ed also assisted on a pair of goals by Eddie Shack for a three point game. Phil Esposito and Ken Hodge also had three point games in the lopsided win.
Over that 1968-69 NHL season, Westfall also had shorthanded goals against the Minnesota North Stars and New York Rangers. His other two game winning goals were scored on the Los Angeles Kings and St. Louis Blues. He continued his power kill in the playoffs with one shorty each against the Toronto Maple Leafs and Montreal Canadiens. He had just three total goals in the playoffs.