You can still Surf, but the moment you pass through a loading area, you will immediately sit back down, thus ensuring that no one else will ever see you surfing on your sparrow again, ever. =(
Good job Bungie, you bastards -__-
Kill all the fun.
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I'd hate to break your joy, but when sparrow surfing, you are the only one who can see yourself... To everyone else it looks like you are sat down