Tldr: They were practicing Mario Kart for the upcoming Mario Kart Hololive Cup but Noel wasn't having a good performance and our favorite Senchou wouldn't let this chance slip away.

Could've just translate the highlight but more context the better I think.

Source:
   • 【#雑ホロ杯 /マリカDX8】みんなで爆走練習会！【ホロライブ/宝鐘マリン】  
   • 【#雑ホロ杯】前夜祭🌸最下位は回避したい(切実)【白銀ノエル/ホロライブ】  

#Marine #Hololive #MarioKart