Things are getting hot.
Syrian fighter jets would last about 20 seconds in a fight with the Typhoons, assuming the pilots were Russian “Mercenaries”.
Les than 20 seconds if the pilots are Syrian.
Su-24s likely wouldn’t engage the Typhoons. It is more likely that this was a probe to determine the response of the British. The Su-24 is an attack/strike aircraft similar to the F-111. The Su-24 can carry anti-ship missiles, though.