Your friend probably did one of three things:
1) Lie to you as a form of a joke and/or mockery
2) He was somehow able seeing energy projection of your desire and/or spell(no physical change are possible but there are traces of it on spiritual and astral plane, not to mention your aura after such spells are used)
3) He was very tired(add some energy drinks, coffee, alcohol or something else and you can get people seeing things).
Its possible its something else all together but you must understand that me and every other member of this community is a bit reserved on the account of that specific type of spells(there are other types of spells with same amount of doubt and/or impossibility) and/or things people claim they saw and/or experienced.
Hope I didn`t insult or offend in any way.