Using Stalker's Mark against the enemy Arch Mother base guardians and teleporting to them places you underneath them. You have to be playing Drifter on the Hidden King team, as the Hidden King's base guardians can't be hit by Stalker's Mark.
Curse is already strong but it can be quite costly to build into in low elo games where others may not pick up the slack while you're saving up souls. The store could also really use more and cheaper items with purge effects - sometimes you really need a fast counter buy for heroes like Billy...
half my screen is covered during gameplay and reconnecting didn't work, it occured as I left the buy phase of the first round while viewing the scoreboard
i have had this happen to me on Billy for a while and it's easily reproducible by just spamming/buffering dash after heavy melee like you said. The fact that he can't dash immediately makes his mobility a little bit worse than intended.
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I played 5 games of Vyper today and this happened to me in 3 of them in lane. Unlocking slither and then sliding immediately after seems to be the cause and it persists after death and reconnect. Unstick is often greyed out in the menu when this happens but typing the console command...