[Anybody know what's going on with this message?]

Happened to me at exploiter fight twice and the black screen stays until you die 4 times and exit the mission

 

[What's that?]

So when i go to fight Exploiter Orb, the moment I start the fight and it starts climbing down to the 2 rocks my screen goes black with that text:

"They were called TENNO. Warriors of blade and gun -
masters of the WARFRAME armor. Those that survived
the Old War were left drifting among the ruins.

Now they are needed once more. The GRINEER, with their
vast armies, are spreading throughout the Origin System.

A call echoes across the stars - as a menace
approaches..."

No idea if that's hinting to something or anything.

Just on a side note - the black screen doesn't go away and you can't open the menus to do anything. All you can do is move blindly and die 4 times to quit the mission. Tested it, it's every time.