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I was just throwing the ball.
About three weeks ago, Mr RR and I had separate issues with him over pull toys, the tug type ones, where he got overly assertive whilst playing with them, so we binned them We've played ball with him since with no incidence. On Monday, we went out to play ball, I threw it twice, he brought it back, the third time, he watched me throw it, but turned and went for me instead of chasing it. We'd been in the garden maybe 2-3 minutes.
We've no idea of his history as he went to the rescue as a stray.
The level of aggression was bad, I was rooted to the spot and just praying he'd calm down, which he eventually did. Later that evening, we were in the living room and he started mouthing me, so I told him to stop and he growled again quite threateningly. My daughter coaxed him out of the house with some biscuits.
He's a lovely dog, cuddly and affectionate, but I can't have that kind of aggressiveness in the home.