InT's imba DotA quiz #2

In the screenshot above, Morphling replicated himself!~ Is that even possible? But the screenshot can prove it is possible. This is done in 6.59d, All Pick mode.

If you know how to do this, please write your answer in the chatbox below.

Clue #1- It is definately not a bug.

Clue #2- It is not Manta Style or Illusions.

Clue #3- It is not -du or -sh and replicate your ally morphling.