Dick laughs, grinning at Tim. "Wouldn't be the first time I've been loud enough for two." He swings his legs over the railing, reaching for one of the vines. "But. I'll be kind and won't shout your ears out."

And it's easier to calculate for Tim's weight. They've worked together for so long at this point, it's almost second nature to figure out what will hold them both. Vines that he's previously used are discarded immediately because they may have weaknesses from being used, especially if he already tandemed with them. Which means finding one is harder, but not impossible.