There is an alternative method if this isn’t working for you. Step by step
1) Highlight, with your mouse the section of the post you wish to quote
2) Right click and select copy
3) Come down to your text box and select the block quote button (looks like two giant quote marks, next to the I and the strike through)
4) Paste in the text you want to quote
5) Add in the spoiler tags to the quote at the front and the end as normal
6) Hit enter to move down and unclick the QUOTE box. This will let you type out your response without being in the quote.
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"He was a lot of things to me" "The only conclusion was love"