both-handed

“I'm ambidextrous,” she replied. “Both-handed. Dad says it's rare.”

[Morimori, looking for a pair of scissors in the desk] Shinzuki Morimori Shinzuki: Yes, that is right. This is asymmetric one, so it is both-handed.

He stood a bit far of the gloom of the lobby, but short of the dazzle of the stairs, and he clenched his briefcase at his chest in a tense and both-handed, reptilian grip, as if whatever he had in it must be guarded at all costs.

The principle of being “both-handed” or “talk for talk and fight for fight” suggests the necessity to combine soft means with tough ones and to struggle while seeking cooperation.