It was definitely an odd situation. Appeared to me to be a fumble.
What made it strange was after the play... officials went to both coaches for quite a while. The white hat went to the Silsbee sideline which was quite odd as Silsbee maintained possession. It left the umpire discussing with the HF coaches. I assumed there was going to be an inadvertent wistle that would have given HF the ball but no advancing of it as the player recovering the ball was not down. Not sure if the officials deemed in was not a fumble or if there was a fumble but an inadvertent whistle before the recovery.
The long discussion leads me to think an inadvertent whistle stopped the opportunity from a recovery of the fumble and Silsbee simply maintained possession. However, it may be that there was no fumble according to the officials.
Again, the strange sequence after the play leaves me still not sure of the official call on the field other than Silsbee maintained possession.