His bigger forearm and hand look swollen. If his bigger forearm's size was the result of greater muscle that would mean that the bodyfat % of his larger forearm was lower than that of his smaller forearm(unless for some odd reason the fat of his bigger forearm increased commensurately with the increased muscle size). Therefore, if that bigger forearm were pure muscle and not due to edema or some deformation then it would appear ripped with all the individual cord-like forearm muscles showing in bold detail. That is not the case. The forearm looks smooth.