Lo Wu and Lok Ma Chau are fairly straightforward; it's really hard to screw up. I'd wager that taking the train to Lo Wu would have been easier for them, actual

Lo Wu and Lok Ma Chau are fairly straightforward; it's really hard to screw up. I'd wager that taking the train to Lo Wu would have been easier for them, actually, because their contact could just meet them in the (relatively) small at-grade Luohu exit that everyone is forced to funnel through.