Come on, Mum, throw it ! (please)

Merlin and Sprite sharing a ball today - for some reason if I threw two they would both go for the same one and I ended up going and fetching the other myself! So only one ball thrown - and a race to fetch it. Sprite is now quicker than Merlin and gets to it first about 8 out of 10 throws. Being younger he would be expected to be quicker, of course, but it took a while for him to get the hang of watching where it is actually being thrown!