This might be the wrong forum, but its the only one that will let me post anything. Mei Ice Block seems to cause Dva not to get her mech back after a Dva Bomb, check my last game ending around 230am EST. thanks.
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If in the event you pressed your ultimate key but during the short window between activating the ultimate and re-entering the mech you are ever stunned, frozen, slept, or hacked. That counts toward an Ultimate Shutdown and will reset your “Baby D.Va” ultimate charge.