If they were taped on it'd be different
Asgore actually asked Gerson about WDG before but Gerson has since forgot, haha. You get that old you forget things! But it does give you a sense for when something is pretty suspicious.
羊爸曾经问过龟爷爷WDG的事，但是龟爷爷忘记了，哈哈。你都这么老了当然会忘记东西啦！但这让你有种奇怪的感觉。
(He's not trying to make them feel bad, he's just concerned)
（他没有在吓唬他们，他只是有些不安）
I never noticed how plump Gerson's arms are until I looked up a reference. :0