Grey Talon ult doesn't give a spirit power stack when the last hit came from knocking someone from zipline

[rapaperez1]

Match ID: 71272522
Time: 10:10

Grey Talon uses Guided Owl to knock and kill Mo off of the zipline, even though Mo was instantly killed by the owl no spirit power stack is given, Mo is not affected by any DoT or Bleed, when looking at the damage log it says Hyperline did the same damage as owl, It seems the hyperline killed mo and the ult was discarded