I was just summoned for the weirdest reason

I got summoned by some person, they drop 99x Marika runes (80K each), then a bunch of starlight. Then the person eats poison and dies and I return to my world. WTF?

I didn't even know there were 99x of these runes, unless this person beat the game repeatedly, got board, and was doing a giveaway. Or hax. lol.