Brennan Johnson has lauded Heung-Min Son after the Tottenham Hotspur skipper produced an ‘unbelievable’ assist on Saturday afternoon. Heung-Min Son made an instant impact against Brighton yesterday after returning from the Asian Cup this week. The Spurs skipper suffered heartache on Tuesday after South Korea crashed out of the tournament in the semi-finals. Yesterday’s game came too soon for Son in terms of starting but after coming off the bench in the 62nd minute, he provided at a crucial moment for Tottenham. After a well-worked move from Spurs in the sixth minute of stoppage time, Son deli…