The herd ambles round the edge of the slope at a deliberate pace and fades into the myrtle, cistus, holm oak and pine.
Boston also nearly blew a 3-1 series edge in the opening round this year against Toronto, before rallying from a three-goal deficit in the third period and capturing Game 7 in overtime.
In a rare attempt on goal for the remainder of the half, Caley Thistle's Esson produced a marvellous save, tipping a Marco Paixao curling effort from the edge of the box round the post.
The recent hot spell had left the course fast-running and bone-hard before the rain took the edge off for the first round.
There is history hanging over Boston, including a blown 3-0 lead to Philadelphia in a series loss in 2010 and a squandered 3-1 edge in this year's first round to Toronto before the Bruins rallied to win Game 7.
Hamilton, who recovered from 9-5 down to edge Michael Holt 10-9 in the final qualifying round of the world championship last week, compiled breaks of 92, 47, 68, 87 and 77.
Colin Montgomerie carded his third successive round of 72, leaving a putt for par on the edge of his final hole, but made the cut by a solitary shot at level par.
But it was Rooney at the other end who twice came closest to breaking the deadlock, his first effort a drive inches wide from the edge of the area and the second a curler that had to be tipped round the post by Cech.
In the remaining second-round matches to be completed, Julien Benneteau won 6-0 in the fifth set to edge past Colombia's Alejandro Falla, while Florent Serra needed four tight sets to eliminate Romania's Victor Hanescu.
But England had clearly done their homework on the left-hander this time round and when Foster showed lightning reactions to whip off the bails after Swann had beaten his outside edge, Yuvraj was gone.
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