A unit of LH (2x2) was charged in the flank/rear by a unit of Aux (1x4) who had another unit of aux (2x2) in front of them. There was about an inch between each unit.
Initial position as below: (Image supplied by Phil Powell Graphics Ltd)

I explained to my opponent that since its existing face was closer to the direction of charge it didn’t get to turn 90 or 180 and since it could not get past by dropping a base it had few options.
Umpire was called (Hammy).
Hammy ruled that the LH turned 90 (sadly I didn’t point out that I believed they couldn’t before he had moved the figures and as that is a bit dependant on the exact geometry and I haven’t got a photo lets ignore that).
Then measuring from their rear they wheeled 3 inches to the direction of charge, then moved another 4 inches sliding a base to avoid the aux to their front.
Post evade position is shown below (actually the LH orientation post evade is horizontal not angled)

The pursuing aux rolled a 6, therefore with 6 inch movement they had the movement to catch the LH.
However, Hammy said that as the LH were still in the path of the original charge (just) the aux could not wheel to follow the LH. The other aux therefore stopped them getting to the LH.
This definitely doesn’t seem logical but does appear to me to be correct to the rules as currently written. (If path just means direction).
One further point is that if upon contacting the other aux if the front base had wheeled clockwise (rather than just stopping at contact) it would have contacted the LH. You are allowed to wheel at any point in a charge. However, obviously this was not declared in the initial charge. Could they have wheeled?