private void GroupHeadPylon(int gridRow, int gridCol, ref PylonGroup pylonGroup)
{
Pylon pylon = _Grid[gridRow, gridCol];
if (!pylon.IsHead || pylon.IsGrouped)
return;
pylonGroup.Register(pylon);
GroupHeadPylon(gridRow - 1, gridCol, ref pylonGroup);
GroupHeadPylon(gridRow + 1, gridCol, ref pylonGroup);
GroupHeadPylon(gridRow, gridCol - 1, ref pylonGroup);
GroupHeadPylon(gridRow, gridCol + 1, ref pylonGroup);
}
