Another bout of selling gripped the U.S. stock market Friday, as anxiety mounts over whether the frenzy behind a swift, meteoric rise in GameStop and a handful of other stocks will damage Wall Street overall. The S&P 500 dropped 1.9 percent, giving the benchmark index its biggest weekly loss since October. The Dow Jones Industrial Average and Nasdaq each fell 2 percent. GameStop shot up nearly 70 percent, clawing back much of its steep loss from the day before, after Robinhood said it will allow customers to start buying some of the stock again. GameStop has been on a stupefying 1,600 percent run over the last three weeks and has become the battleground where swarms of smaller investors see themselves making an epic stand against the 1 percent. The assault is directed squarely at hedge funds and other Wall Street titans that had bet the struggling video game retailer’s stock …