McTominay forcefully grabs Cucurella and drags him along for 6 seconds to stop him taking a quick throw for a counter attack and receives no punishment having already committed 3 fouls. Martinelli a clear yellow leading to immediate red, what's the differ

McTominay forcefully grabs Cucurella and drags him along for 6 seconds to stop him taking a quick throw for a counter attack and receives no punishment having already committed 3 fouls. Martinelli a clear yellow leading to immediate red, what's the differ