Tkachuk went on his sled without a helmet, which did not fly with Easton.
"Why aren't you wearing a helmet," Easton asked the Senators forward.
Tkachuk quickly followed the safety rules and put on teammate Shane Pinto's helmet.
The boys raced Tkachuk on their sleds and shot pucks on net.
"This has been a lot of fun," Tkachuk said in the video. "[It's] hard work. I'm sweating more than I did in practice."
After playing on the ice, Easton and Cameron received signed sticks from Tkachuk and got to check out his locker stall.
"We were really happy that Brady was willing to jump on with them and push the sport," Easton's dad Ryan Harris said in the video. "They all know about it [sledge hockey], but we want the rest of the community to learn about it. Everybody that has a disability can get on a sled, there's a way to get them on there…It's a great community."