targetPosition = bar3pos + targetBarIndex;
				safeDown = Math.max(barHeights[targetBarIndex] + currBlockHt, target1Ht);
				safeDown = Math.max(safeDown, target2Ht);
				safeDown = Math.max(safeDown, maxBarHt);

				if (currBlockHt == 2) {
					targetPosition = bar2pos;
					safeDown = Math.max(target2Ht + currBlockHt, target1Ht);
				} else if (currBlockHt == 1) {
					targetPosition = bar1pos;
					safeDown = target1Ht + currBlockHt;
				}
				while (arm2 > targetPosition)

					break;