Marco pulled one hand off of Oliver just long enough to flash a thumbs up for both Oliver and Juno. He was sure that now that his heart was racing from fear or excitement or whatever the hell he was feeling, he'd be fine, no matter what was going through his mind. And once they were moving, he even loosened his grip on Oliver a little bit when he felt like he was steady enough that he wouldn't fall off. This actually wasn't so bad.
After a moment, he turned to look over his shoulder, flashing a wide grin at Jack and Juno. He still didn't feel brave enough to let go so he could wave, but this wasn't so bad. "What do they say in movies when they're going on the dog sleds? Mush? Tally-ho? I don't know, go faster!"