WATCH: Irish fans rage as referee fails to reach for a card after sickening hit on Dave Kearney

It's like a battlefield out there.

Sean O'Brien limped off, Mike McCarthy was a bloody mess and Johnny Sexton was left in a heap after an off the ball challenge. But Dave Kearney looked to have taken the worst hit of all as he was forced off in the first half of Ireland's second Six Nations tie in Paris. Kearney was clattered by a high shoulder from French hooker Guilhem Guirado and left the pitch with his arm clung tight to his chest in a makeshift sling. The players couldn't believe it. https://twitter.com/lukefitz11/status/698523100011499520 https://twitter.com/SeanCronin2/status/698525974380597248 https://twitter.com/Gordonwdarcy/status/698522391794814976 https://twitter.com/TrevHogan/status/698523453167689728 And it wasn't just the players and former players who were incensed. https://twitter.com/Sadhbh15/status/698524138894393344 https://twitter.com/BenMon92/status/698525477494001668 https://twitter.com/cooper_m/status/698526410848268288 https://twitter.com/Galvo1995/status/698526222494646272 https://twitter.com/jhenry_irl/status/698524859068981248 https://twitter.com/NickPurewal/status/698526706425032704