Wolf had seen Nathan's journal entry after rolling out of bed, and he hadn't bothered to comment lest he waste too much time and get there late. He had missed the other snowball fight at the Spinellis' and thought the new, jock-endorsed one sounded much better than bolstering a bunch of nerds.
As it was, he ended up doing the uncool thing and arriving early, though it quickly became obvious he wasn't alone when he spotted Nathan making snowballs. "Hey!" he called out, because though he figured Nathan could hear him approaching (Wolf had been amazed to learn snow made a sound when people walked through it the first time someone had explained it to him), he never liked to scare people – well, unless he was trying. When people walked up behind him, it was very easy to startle him.
"What's up?" he asked. "And before you even think of answering, turn around so I can see your face."