He was running on that side of the wicket so if he stayed in a straight line would more likely be able to block the ball. He deviated away from the ball which IMO he should have been given the benefit of the doubt for. If it was the other way round it's probably the right decision, someone he deviates but moves further from the ball I have no idea why that's given out.
Some strange rules still exist in cricket. Take Joffra Archer for example, born in Barbados to a Barbadian mum and an English dad, but despite that (and seemingly being able to get a UK passport) cannot play for England until he has completed a whopping 7 years residency in the UK. Crazy rules that will rule out a top talent from playing International cricket as he wants to play for England, and also won't qualify to play for the Windies because of the WCB's ridiculous qualification rules for players having to play domestic cricket in the WI. In the majority of other sports, he could immediately play for that country as he would be a UK citizen by descent, but cricket......................