Was leveling my engineering in gadgetzan and watching tv, saw that i had the last 3 plans available from the trainer while i was still crafting things, i spammed train not paying attention and it took the gold but i didnt teach me the skills, tested it a few times after being confused to make sure it was actualy taking the gold. ended up losing over 25g from spamming the train button. So if your crafting something while pressing train on this trainer (didnt test on any others) it takes the gold and dosent give you the schematic because your busy crafting. Edit: It also takes the money and does not give you the pattern if you jump while learning them as well.
