I'm very sorry for your loss.
Blue Whale seems to prey on the insecurity of people in a very malicious way. While Overwatch might not be at fault, his group of friends is. Competitive Overwatch is an extremely team oriented game and this is especially true if you are able to climb as high as your nephew did in the ranks. Coordination, communication, and trust play a big role in success in the higher ranks, sadly it did not translate to the real world.
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