You should put a mine at your current position or at a point where you know he MUST come around. As you hear your mine you have 2 choices: 1.you kill him 2.you use your teleport to get away I would recommend to teleport to/near your team.
Make sure you pickup Totemic Ward which gives CC immunity to anyone in your healing totem range. This can cripple a Torvald's Ultimate. Also great load against other CC champs like Cassie, BK, Tyra, and Pip Evil Mojo(Chickens).