What kind of inflection is occuring in passive vb + かかった?


I was using Jisho.org to help me figure out the tense of the following passive
verb

> 殺されかかったんだ

when it decides to combine 殺され (passive form) with かかった thereby forming
"殺されかかった" as a 'recognized' whole verb (recognized meaning its fully
underlined in the link thingy).

I still don't know what the two かか's mean, although my bad gut intuition is
saying that the first か is a question particle, thereby making it a passive
question parsed by かったんだ.... I really am confused as to what it means and how
to parse the segments correctly.

> Original sentence: ……そうだ, 殺されかかったんだ




> 「Verb in 連用形{れんようけい} (continuative form) + かかる」

means:

> "to be about to (verb)", "to be on the point of (verb)ing", etc.

The first verb used in this expression can be either in the active or passive
voice form. Active or passive, Japanese verbs still inflect in the same
manner.

**_Active voice_** : 「殺し」 is the 連用形 of 「殺す」

「殺 **し** かかった」= "was about to kill"

**_Passive voice_** : 「殺され」 is the 連用形 of 「殺される」

「殺 **され** かかった」 = "was about to be killed"

The two か's cannot be separated as 「かかる」 is just one verb.




> 「Verb in 連用形{れんようけい} (continuative form) + かかる」

means:

> "to be about to (verb)", "to be on the point of (verb)ing", etc.

The first verb used in this expression can be either in the active or passive
voice form. Active or passive, Japanese verbs still inflect in the same
manner.

**_Active voice_** : 「殺し」 is the 連用形 of 「殺す」

「殺 **し** かかった」= "was about to kill"

**_Passive voice_** : 「殺され」 is the 連用形 of 「殺される」

「殺 **され** かかった」 = "was about to be killed"

The two か's cannot be separated as 「かかる」 is just one verb.

