I believe this happens if you upgrade or pick skill 3 (the passive sliding one) during a slide. I could reproduce this multiple times. Just press tab+3 while sliding (tab for me is the shortcut for levelling a skill)
Shrink ray item of course. With self/ally cast for tunnel movement, but also used on enemies in combat!
Also I envisioned Krill entering the tunnels alone while Mo "waits outside" (reappears where you exit). Maybe disable Mo abilities while tunneling, so Krill can really only shoot so he's...
Imagine if you could have a hero that could view the map top down (of course they could only see enemies that are actually spotted in-game, like the minimap) and could place and upgrade defensive structures, call in supply drops, give movement orders to team, and more... Think the commander from...
+1
In addition, when you are Shiv it does not show stacks of the Serrated Knives under (or is it over?) the enemy HP bar. It is as if Serrated Knives is not a "true" stackable debuff, although I see no reason why it shouldn't be.