void talk_function::start_training( npc &p )
{
    int cost;
    time_duration time = 0_turns;
    std::string name;
    const skill_id &skill = p.chatbin.skill;
    const matype_id &style = p.chatbin.style;
    if( skill.is_valid() && g->u.get_skill_level( skill ) < p.get_skill_level( skill ) ) {
        cost = calc_skill_training_cost( p, skill );
        time = calc_skill_training_time( p, skill );
        name = skill.str();
    } else if( p.chatbin.style.is_valid() && !g->u.has_martialart( style ) ) {
        cost = calc_ma_style_training_cost( p, style );
        time = calc_ma_style_training_time( p, style );
        name = p.chatbin.style.str();
    } else {
        debugmsg( "start_training with no valid skill or style set" );
        return;
    }

    mission *miss = p.chatbin.mission_selected;
    if( miss != nullptr && miss->get_assigned_player_id() == g->u.getID() ) {
        clear_mission( p );
    } else if( !pay_npc( p, cost ) ) {
        return;
    }
    g->u.assign_activity( activity_id( "ACT_TRAIN" ), to_moves<int>( time ), p.getID(), 0, name );
    p.add_effect( effect_asked_to_train, 6_hours );
}
static void test_fast_shooting( npc &shooter, int moves, float hit_rate )
{
    const int fast_shooting_range = 3;
    const float hit_rate_cap = hit_rate + 0.3;
    dispersion_sources dispersion = get_dispersion( shooter, moves );
    std::array<statistics, 5> fast_stats = firing_test( dispersion, fast_shooting_range, {{ -1, hit_rate, -1, -1, -1 }} );
    std::array<statistics, 5> fast_stats_upper = firing_test( dispersion, fast_shooting_range, {{ -1, hit_rate_cap, -1, -1, -1 }} );
    INFO( dispersion );
    INFO( "Range: " << fast_shooting_range );
    INFO( "Max aim speed: " << shooter.aim_per_move( shooter.weapon, MAX_RECOIL ) );
    INFO( "Min aim speed: " << shooter.aim_per_move( shooter.weapon, shooter.recoil ) );
    CAPTURE( shooter.weapon.gun_skill().str() );
    CAPTURE( shooter.get_skill_level( shooter.weapon.gun_skill() ) );
    CAPTURE( shooter.get_dex() );
    CAPTURE( to_milliliter( shooter.weapon.volume() ) );
    CAPTURE( fast_stats[1].n() );
    CAPTURE( fast_stats[1].adj_wald_error() );
    CHECK( fast_stats[1].avg() > hit_rate );
    CAPTURE( fast_stats_upper[1].n() );
    CAPTURE( fast_stats_upper[1].adj_wald_error() );
    CHECK( fast_stats_upper[1].avg() < hit_rate_cap );
}