Azir ultimate is not stopping hecarim ultimate

[GAMEPLAY] Azir's Emperor's Divide is not blocking Hecarim's ultimate

Azir's ultimate does not block hecarim's ultimate at any point during the use of either champions ultimates. it doesn't matter if azir has his wall up and hec ults into it or hecarim ults first and azir throws the ult out in an attempt to stop it. Result is that hecarim can freely dash through azir's soldier wall unhindered and the spectral riders also go through unopposed. If i recall correctly azir's ult is supposed to stop ANY dashing ability, so I would like to think this counts regardless of hecarims unit collision passive (i.e. he cant walk through anivia's W). I do not believe that items made any difference in this as it happens at all stages of the game (from 20 to 40 min mark).