The teenager quipped in return, got a better idea?
Valkyrie huffed sharply in response, watching the bison herd for a long moment before she spoke again.

"Spar." Was all she said in the moment, looking at Abaddon then with an expectant purple stare.
Was it a suggestion made to (hopefully) ward him from potentially killing himself at the horns and hooves of the Bison? Absolutely. 
And if the boy tried to insist on pestering the powerful beasts...well, she would risk Nyra's ire at manhandling her child if it meant he would live to see another day.

As was her duty.

Still, she didn't yet move for Abaddon, instead allowing him the opportunity to make the smart choice to spar.