Leif got Tristan this little cat harness and leash.
We let Tristan wear the harness for a while until he got use to it.
Then we attached the leash and used a laser pointer to guide him around the house.
Once we felt like he was ready, we led him outside.
This was his reaction:
Bet then he started feeling more confident to explore.
0.0! A TREE!
Tristan knew exactly what to do with the tree.